CapnZapp
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The only important criteria is
Code:
number of play sessions per level[/quote]
Do you level every other session on average? Every third? Fourth? Fifth?
On one hand, you have the DM that want to preserve at least a veneer of believability and not go zero to hero "too" fast. On the other, how long before your players grow bored with their current abilities and want to become faster harder scooter.
This is the only question. Everything else is just chaff.