Unless it's a perfect day for riding, I
try
to take a full day to work on the bike. Tinkering is my second favorite thing to do with the bike. Otherwise I'm too often conscripted to dusting, vacuuming, raking, digging or the absolute worst - shopping!
Seriously though, the first time I do anythingwith the bike, it takes about three times longer than "normal" and I always, always, always find something more that I want to do. But I've only had my bike for a year and she, as advertised, "needs a lot of TLC to make really nice".
Good luck and have fun, but don't get so caught up in working on the bike that it eats into your riding time.

John M