mutation wise or just breeding wise?

Breeding wise after 5 generations possibilities are basically endless, within reason of course. You could probably turn a 13 week sativa that tastes sour into a 7 week indica that tastes sweet.
Mutations wise, I honestly haven't any idea, I know some theory behind it but I have no idea on what type of time scale it happens. I think its mainly breeding that would have an effect on the plants even if you did get them the mutate. Usually plants the mutate don't grow well and lag behind, you might flower them or cut them but no one would breed with them because they already have negative mutations that hamper it. You would probably end up with something pretty damn similar to if they were grown and breed in optimal conditions though.

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