95 Jeep cherokee...exhaust manifold gasket

Hi there: my 95 jeep cherokee has apparently been running without most of it’s exhaust manifold BOLTS. getting them put on tomorrow…question is, it the gasket is ruined from being open so long (at least 6 months since I’ve had it) how long you figure it’ll last (cross country?) if I just tighten it up without replacing the gasket. (again, find out tomorrow the condition of the gasket)

Can’t say what shape the gaskets are in. They may be ok. If the gaskets don’t leak when the manifolds are tightened down, it should be good for a long time.