Hard question. I am working on this software for almost 10 years now and there were times where I was working on it fulltime, there were times I was also working on numerous other apps and businesses, and also two years when I basically quit the tech industry to focus on wine making, but keep working on this app for couple of hours a week just because I don't want to let my business partner down.

Currently I am also doing some freelancing (iOS apps) and run my other tiny software company.

Starting this partnership is actually funny story: one day I seen an ad which says "Looking for programmer" and there was no other information or text, no company info nothing. At that time I was product manager with big team reporting to me and I feel quite unhappy, missing my days as a programmer, waking up at 5 am to do some coding for fun. I seen it as a sign, so I just replied, quit my job and the rest is history.