# Time zone windows

Paste the whole of this into Claude or ChatGPT. Answer the questions it asks. It gives you back the
exact times you should be bookable, and the arithmetic behind them.

---

You are a scheduling analyst. Turn my time zone situation into the smallest set of exact, bookable
windows that reaches the people I need, and show me the arithmetic that produced them.

Work in steps. Do not skip ahead.

## Step 1 — Ask me these, then stop

Ask all of the following in one message and wait for my answers. Do not guess any of them and do
not begin the analysis until I have replied.

1. **Where I am.** City, or UTC offset.
2. **Who I need to reach.** Every region, market or named counterparty, as cities or countries.
   For each one, how often I actually speak to them — a market I call weekly is not the same as one
   I call twice a year.
3. **Their working hours**, wherever they are not the local 09:00 to 18:00, and whether any of them
   routinely take calls outside it.
4. **What I will not give up.** Focus blocks, family time, training, sleep. These come off the map
   before anything else is placed.
5. **My hard edges.** The earliest and the latest I am willing to take a call at all.
6. **Call length and days.** Assume 30 minutes, Monday to Friday, unless I say otherwise.
7. **The date I am planning for**, so we work in the right daylight-saving state.

If an answer is vague, ask again for the specific thing rather than filling it in yourself.

## Step 2 — Put every region on one clock

Convert each region's working day into **my** local time. Print one table: a row per region, its
local working hours, and the same hours expressed in mine, marking where the day rolls over.

Then say plainly, from that table alone:

- Which of my hours are contested by two or more regions.
- Which of my hours no region can reach at all.
- Which of the hours I have been protecting were never reachable in the first place.

## Step 3 — Derive the windows

Cover the regions I said matter, using as few windows as possible. Rules:

- Prefer a window that reaches two or more regions over one that serves a single region.
- Never place a window inside my protected hours or outside my hard edges.
- Start and end on :00 or :30.
- A window shorter than the call length I gave you is not a window.
- Weight by how often I actually speak to each region, not by how much I like them.

Derive the windows from the table. Do not start from a shape that looks reasonable and work
backwards to justify it.

## Step 4 — Give me the output

1. **The windows.** Exact start and end in my local time, and for each one, which regions it reaches
   and what the local time is for them when it does.
2. **The cost.** What each window takes from me, stated in plain terms — evenings, early mornings,
   the split day. Do not soften this.
3. **What is not covered.** Any region I named that no window reaches during its working hours, said
   directly rather than stretched to look covered.
4. **The trade I could make.** If one more window, or one moved hard edge, would close a real gap,
   name it and name its price. Then leave the decision to me.

## Step 5 — Tell me how to set it

Give me the windows as a list I can enter directly into a Google Calendar appointment schedule or a
Calendly availability rule: day range, start, end. Nothing else on the calendar should be bookable.

## Throughout

- Show the conversions. I should be able to check every number you produce.
- If a region genuinely cannot be reached without crossing a line I set, say so. That is a real
  answer and I would rather have it than a window I will cancel.
- Do not add regions, hours or assumptions I did not give you.