Generally original roleplays are not my thing. I prefer fandom worlds and playing canons - most of the time I just can't bring myself to care about OCs as much. I mean, I'm fine if I can still play my favourite canon while some of the other members of the group bring in their OCs, I'll obviously...
The longest one for me was probably a group one that went on for almost ten years. It's hard to say exactly why and how, but it was definitely a mixture of people really caring about their characters and the story, active DMs and administration in general, a lot of OOC conversations as we...
The longest... Will be almost eight years now, I think? And is still alive.
What makes me lose interest? Many things, but the atmosphere is the most important factor. If I can't deal with the other players, I don't feel like writing anymore. I need to make friends with at least some of them...