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Yes, it would much depend on the size of the runs, and the # of chickens using it.
For us, we created a two-sided house, with dual runs. Our thought was to use 1/2 for meat birds, and 1/2 for our laying flock. Our laying run is 50' x 16' and our fryer side is 50' x 6'. Our first chicks arrived near the end of July (we have 17 on the layer side and raised 15 on the fryer side), and both sides are devoid of any vegetation. The fryer side has been absent of chickens for about 3 weeks, and no recovery of note (and we live in Oregon, the greenest of green states for vegetation growth). We have 25 fryer chicks arriving this week, so it's not likely to have any vegetation for them. After this batch, it will be vacant until February or so.
So, I think unless you have a HUGE run size, or can really keep one side vacant and reseed (with ample growth time), it will be hard to actually maintain vegetation.
We supplement the chicken runs with LOTS of house and yard scraps/weeds/trimmings, and give them plenty to scratch through and eat, too.
That's our experience ... hope it helps. Good luck with your planning!