I like the Shape Up approach. I'm currently the solo dev at a company and I have taken Shape Up and cut it down to the bone. When I'm asked about how long somet

I like the Shape Up approach. I'm currently the solo dev at a company and I have taken Shape Up and cut it down to the bone. When I'm asked about how long something will take I say "give me x days and we'll see how far I can get". Often one or two weeks. This is honest and understandable.