Endurance is the ability to work before results become socially interesting.

A period exists before results do, where the work has no social value at all. Nobody asks about it, nobody is impressed, and you have nothing to show. Being able to work through that period is what separates people who finish long things from people who need an audience.

Expect the quiet period and plan for it. Do not seek encouragement you have not earned yet. The interest arrives late, and by then the work that mattered is already done.