That seems reasonable to me. I'd have to prioritize the treasure level over other projects (JJ2 and non-JJ2 alike) once in a while, but a month and a half seems more than enough anyway.

At least I expect this contest to gain more finished entries than the Diamondus Warzone Remake one. As there are basically no restrictions here other than making it a treasure level, a gamemode that's still open to new ideas and thus easier to be original in.