n00b question about attacking with waves

Hello everyone, I'm a new player, level 27, just starting to get to bandit camps that can't be defeated in 1 wave. I've read the combat guide here, and have played around with some of the simulators, but before I start killing off all my troops, wanted to understand a bit more about waves -- and whether or not I need to have 2 generals attack in quick succession to pull off these camps, or can I send a general, wait 4 hours or more, then send the 2nd wave? Do bandits slowly regenerate?
thanks!

There is no benefit for sending waves in quick succession for single camps :)

So you can slowly pick them apart when you have troops available for each individual wave.

many thanks for the quick answer!