When it's getting too dark, cold and uncomfortable for camping.
Why are you doing this?
I often hear that or similar questions.
Many people don't understand why anyone would travel by bicycle. It's so exhausting.
For me it's the best way to travel.
Why I love it and why the effort is paying off, you can read here.
Some ask directly. Some do it after some time. You can see that some really want to, but they never ask for it. Whether before the trip, in the middle or probably afterwards. The one big thing.
Money.