What are the cool downs for swapping skill/runes?
According to the combat skills section of Blizzard's online game guide, the cooldowns for swapping skills are:
- Normal: 5 seconds
- Nightmare: 10 seconds
- Hell: 15 seconds
- Inferno: 2 minutes
These cooldowns only apply if you switch skills outside of town. You may freely switch skills in town with no cooldown.
There is a 5 second CD on Normal difficulty unless you are in a town (no CD at all).
- Normal: 5s
- Nightmare: 10s
On higher difficulties the cooldown will be even longer.