Well, now that WC8 is over [well, wrapping up], I'd like to put this back on the table.
Thinking about it some more, I agree that sub-15 minute compos are silly for anything past some ASCII things we've done.
So, 30MC, OHC and 2HC are ideal time formats. They are quickies collectively, as opposed to major battles.
ant1's post seems to have the best things out of the thread streamlined, so I don't have much else to add.
And I am extremely for having a sub-hour time format. 30 minutes seems ideal, 15 is too short, and 45 would be awfully similar to an OHC.
The other thing that would be a bit of an issue with b00daw's more aggressive format would be asses that would push the entry count up with 0-effort entries just to make the cutoff happen [in an OHC, submitting 0-effort stuff doesn't matter, it just gets 1-voted and doesn't illegitimately force the compo to close]. Maybe making the minimum time 15-30 minutes before the cutoff period can happen? And the selectable minimum for entrants be 4 [and max at 10, because these are of indefinite length].
I know admins would [and can now] deal with those scrubs that would just push to end, but it would also keep entry quality a little higher by guaranteeing some time.
A 3 minute end period after the entrant limit is reached would be good. It'd be a bit of a race still, and those caught in the ending period would still be able to attempt a shot at entering. The /Submit/ page would be disabled after the end period.
Oh, and since you are guaranteed a minimum amount of entries, don't give b00ns back.
tldr: 4EB minimum, 10EB max, 15 or so minutes minimum possible compo length before close, 3 minute close period after the entry minimum is reached.
And I see no reason at all to limit voting for xEB, that's just silly. The more the merrier is always a thing when it comes to voting.