Antagonist,
Most of the builds have a time frame,
but they are usually 2 months or more from what i have seen.
also, not all the builders finish on time.
there is no penalty or punishment for going beyond the 'deadline'.
the builds are open to all who are interested, without cost.
i would encourage you to join one that looks interesting.
you may find that working 'with' other modelers inspires
or motivates you to work at a faster pace or sneak in an extra session or two.
or you might find yourself hanging around the forum at the expense of
precious modeling time.
[:0]
but please don't hold out over the 'deadlines'.
they are quite loose.
the group build posts now lose their sticky status a month or so after the deadline, but you can still post to the thread. you just might have to dig for it first.
i have participated in two builds and will be joining the towed gun build,
even tho it has been in progress for a while.
it was a great learning experience for me.