Great question : I answer always the same !
And for those who do not ask, they think that the airplane is ready to fly.

Well, for this project, I have no schedule.
I ‘amused’ to build every night of the week.
The rest of the time I’m busy elsewhere (wife, children, other passions, work).

Because having a schedule for construction is synonymous with frustration if there is any delay. And who says frustration, said lower quality.