I've answered both but not at the same time.

I would like to have one main compo once a year, for example across the
new year like now, maybe shorter than 4 month but not far from it.

Also, it would be nice to have say 2-3 short compos during every year,
maybe march-june/july-october.

I say so because last year i got some big troubles with my daily job
right before the first deadline that forced me to retire. It this is gonna
happen again at least i can get into the next one without waiting for 12
month. Also it would generate more traffic/activity on the forums by
the community.

Of course the 2-3 months compo should be more complex than the 1
months (or 3 weeks) one, like MMO-game the long and a simple arcade
the second.. stuff like that