Aaron,

Years ago when my family built homes it was nothing to have a poured slab set for months before framing ever begin.

Actually, it is supposed to allow the concrete to cure out better.

I would only advise that the plumbing vents all be capped off to prevent kids from dropping debris down them. Kids are bad about dropping rocks and trash down the inside and blocking up the drain lines.

Should not be an issue for the slab though. They might want to go ahead and temporay seal up any tub traps to prevent excessive moisture from soaking into those areas.

rick