Working With an Offshore Assistant Across Time Zones: Overlap Tables and a Daily Rhythm

The "follow the sun" idea sounds great: hand off work at the end of your day and wake up to finished tasks. For an executive assistant, it rarely works in practice. Urgent emails wait eight hours, scheduling takes days of back and forth, and small questions turn into overnight delays.

What works is planned overlap: enough shared hours for live collaboration, combined with clear handovers for the rest of the day. This guide shows how much overlap you get from different regions, how much you actually need, and how to structure the day around it.

How Much Overlap Do You Need?

It depends on the role:

Role	Shared hours per day	Why
Executive assistant	3-4 hours minimum	Live scheduling, urgent email, daily check-in
Customer support	Depends on your customers' hours, not yours	Replies need to arrive while customers are awake
Sales development	4+ hours in your prospects' time zone	Calls and replies happen during business hours
Research, bookkeeping, content	0-2 hours	Work can be done asynchronously with clear briefs

For an executive assistant, three to four shared hours is enough for a daily check-in, live requests and a proper handover. More is useful, but less than two usually causes delays.

Overlap Tables

The tables below show shared hours with a client working 9am-5pm in each city. Assistant hours are local time.

US winter (November to March)

Assistant location	Assistant hours	New York	San Francisco	London
North Africa or Central Europe (UTC+1)	9am-6pm	3 hours (9am-12pm ET)	None	8 hours
North Africa or Central Europe (UTC+1)	12pm-9pm	6 hours (9am-3pm ET)	3 hours (9am-12pm PT)	6 hours
Philippines (UTC+8)	9am-6pm	None	None	1 hour
Philippines (UTC+8)	10pm-7am (night shift)	8 hours	6 hours	None
Colombia (UTC-5)	8am-5pm	8 hours	5 hours	4 hours

US summer (mid-March to early November)

Daylight saving time changes the picture. The US and UK move their clocks forward, while some countries, including Tunisia, Colombia and the Philippines, don't use daylight saving at all:

An assistant in Tunisia working 9am-6pm gets 4 hours with New York in summer, up from 3, and 1 hour with San Francisco.
The same assistant shares the UK's clock time in summer, giving a full day with London.
Overlap with Colombia shifts by an hour in summer: 8am-5pm Bogotá becomes 9am-6pm in New York, still covering almost the whole day.

The lesson: check your overlap in both seasons before agreeing working hours, and confirm them again when the clocks change.

Choosing the Right Setup

US East Coast founders: an assistant in North Africa or Central Europe covers your morning in standard hours and most of your day if they start at midday. Latin America covers the whole day.
US West Coast founders: Latin America gives the most natural overlap. Assistants further east need to shift their hours significantly, or work nights in Asia.
UK and European founders: North Africa and Eastern Europe share your working day with no schedule changes at all.

For a fuller comparison of regions, including language and cost, see the best countries to hire offshore talent.

The Daily Rhythm That Works

Whatever the overlap, the same structure keeps things moving:

Start-of-overlap check-in (10-15 minutes): agree today's priorities, answer open questions, make quick decisions
Live work during the overlap: scheduling, urgent email, anything that needs back and forth
Async work outside the overlap: research, documents, reports, inbox sorting and preparation for tomorrow
End-of-day summary in writing: what's done, what's pending, what needs your decision, and what they'll do first tomorrow
Weekly review (30 minutes): look back at the week and plan the next one

The end-of-day summary is the most important habit. It means you never have to ask "where are we on this?"

Making Async Work Well

Outside your shared hours, good handovers replace conversation:

Write complete requests. Include the goal, the deadline, what good looks like and any constraints. Half a sentence in chat creates a question that waits a day.
Record short videos for anything visual or complicated. A two-minute screen recording saves a long email.
Agree response times: for example, urgent within an hour during overlap, everything else by the next check-in.
Keep one shared task list so priorities are visible without anyone asking.
Define "urgent." Agree how the assistant should reach you if something truly can't wait, and what counts.

Practical Details People Forget

Show both time zones in your calendar, so booking mistakes don't happen.
Share public holidays in both countries at the start of the year.
Set out-of-hours expectations clearly. An assistant who's expected to answer at any hour will burn out.
Recheck overlap when the clocks change in March and October or November.

Handled well, time zone differences become an advantage: your assistant can prepare your day before you start and close loops after you finish. Our 7-day onboarding plan shows how to set up this rhythm from the first week.

Frequently Asked Questions

How many hours of overlap do I need with a remote assistant?

For an executive assistant, three to four shared hours a day is usually enough for a daily check-in, live requests and handovers. Research or bookkeeping roles can work with little or no overlap.

What's the best time zone for an offshore assistant working with US clients?

Latin America shares most of the US working day. For US East Coast clients, assistants in North Africa and Central Europe share the morning in standard hours and more if they start later.

Can a Philippines-based assistant work US hours?

Yes. Many work night shifts to match US clients. It's common in the industry, but discuss it openly, as working nights long term affects wellbeing and retention.

How do I manage an assistant in a different time zone?

Hold a short check-in at the start of your shared hours, use a shared task list, write complete requests, ask for a written end-of-day summary, and agree response times and what counts as urgent.

Does daylight saving time affect overlap?

Yes. The US, UK and EU change their clocks on different dates, and many countries don't change them at all, so overlap can shift by an hour for part of the year. Check it in both seasons.

If you'd like help finding an assistant whose hours fit your day, book a call.