Noah invested about 100-120 years in building an ark (Gen. 5:32-6:22). That’s a long time, even in those days. It would be like someone today spending 10-12 years building a boat, car, or house.
Do you think you would tire of building something for that long? I do. No doubt some days would be tedious. Others just a hassle or filled with the question, “Will this ever be done?”
On top of the length of time in building the ark, Noah was building for something never seen.