They'll probably survive. The only reason I would bother to re-veg would be when I didn't have a mother. It's much easier and faster to start from fresh clones.
The basic rule of thumb is that the root system needs to be roughly the same size as the plant above the soil. Whatever you take off the top, you should take a roughly equal amount off the roots.
some of my revegged plants take 3 weeks to be ready to go back in flower cab, some others take as long as 3 months.
But I always manage to reveg, so that amazing clone we love and think we killed may yet be saved, just gotta read the threads on the subject and give it a go.
keep track of nutes in your medium too as the plants may've exhausted the majority of what was there for the plant the first grow. should be ok from what i know. best of luck buddy!