Leave Second: How to know the foundation will hold

Two weeks ago: The map. Last week: Build first. Today, the leg that frightens people most, leave second.

This is the one everyone wants to rush and almost everyone gets wrong, in one of two directions. Some leave far too early, on a good month and a feeling, and crash. Others never leave at all, waiting for a certainty that never arrives. The skill is leaving at the right time, for the right reasons, on evidence rather than nerve.

You do not leave when you have won

Here is the part that surprises people. I left my £60k job in August 2025, five months after launching the product. The business had not yet reached anything near £500k. That came later, in the twelve months after launch.

So I did not leave because I had already won. I left because the foundation could hold weight. Those are different moments, and confusing them is costly in both directions.

Leave too late and you waste years of choice you had already earned. Leave too early and you turn a calm build into a frightened scramble. "Leave second" is not "leave once you are rich". It is "leave once the thing you built can stand on its own, and a little before it feels comfortable".

The leave test

Replace the feeling with three proofs. Do not hand in your notice until you can answer yes to all three.

1. Does it earn without you borrowing from the job? Not one spike. Repeatable revenue across several months, earned in the few hours a week you can spare. If it works on scraps of your time, it will grow when you give it your days. One lucky month is not proof. A boring, repeatable pattern is.

2. Does it survive your worst week? The real test is not your best week, it is your most tired one. If the business only moves when you are fresh and motivated, it is still a hobby that depends on your mood. If it keeps earning through a flat, exhausted week, it has a structure underneath it, not just your enthusiasm.

3. Do you have runway? A cash buffer that covers your essential costs for a defined stretch. Six to twelve months is sensible for most people. Runway is what turns leaving from a gamble into a decision. It buys you the calm to keep making good choices in the first hard months after you go.

Three yeses and leaving is a considered step. A no on any of them, and you are not ready, however much you want to be. The test does not care how much you dislike Monday mornings.

Leave on evidence, not on emotion

Most resignations are emotional. A bad review, a missed promotion, a manager who finally tips you over. The feeling is real, but it is a poor signal, because it fires when you are least prepared, not when you are most ready.

The leave test exists to take the decision out of your worst afternoon and hand it to your evidence. When the three proofs are in, you can leave from a position of strength: calmly, on notice, on good terms. You are not running from a job. You are walking towards something that already works.

Leave well, not just on time

When the proofs are in, go properly. Serve your full notice. Leave colleagues and managers on good terms, because the professional world is smaller than it looks and your reputation outlives the role. A clean exit costs you nothing and protects relationships you may want for years. The point of building quietly was never to slam a door. It was to be able to open a new one without panic.

Before you go

One thing to hold onto: you leave when the foundation can carry weight, not when the business has already won, and not when you simply cannot stand another meeting. Evidence, not nerve.

So tell me. Of the three proofs, repeatable income, surviving your worst week, runway, which is the one still missing for you? Reply and name it. I read every reply myself, and the gaps you share decide what I write about next.

Next Monday, the last leg of the arc: Choose third, and what work as a choice actually looks like once you are there.

See you then.

Izhar