Question on how steemit works

So my question basically is, lets say you have a significant amount of steam power, if you upvote 100 things a day, is your power spread out across those 1 things? (vs upvoting 1 thing and all your power going to it?)

Also, what is the interval that your steam power "recharges" to give the full benefit of the upvote again?

Thanks in advance for your help understanding it!