S*o why does the challenge have to start at the begining of each month... You take 4 weeks say for the challenge entries, then a week for the voting. Then after that start another 4 weeks + 1 week voting.

*Overlooking winner announcement time and time for winner to pick a new challenge.

Then you are close to bi-monthly and it is easier to keep track of deadlines. I've said enough.  I've cast my vote.
ps

The mods time and devotion here have to be considered also.