I can easily say that I spent the most time on BL1. Before I quit gaming a while back for like three years I remember playing the living hell out of BL1. Farming and exploring the armory was my favorite thing to do. The zombie DLC also made me had a blast. I easily put the most time into that one.
For now I’m just finishing up BL2 since I never finished it. I might surpass the time that I spent on BL1 with BL2 since it’s getting me pretty hooked.
As for TPS, it was fun, but I lost replay value once I hit 60 because there aren’t any pearls and because I’m waiting for the next DLC. Once those are released I’ll hop back on there for a while.
How about you guys? Which one did you spend the most time on/will you spend the most time on in the future?