Re: [12000 GH/s] Slush's Pool (mining.bitcoin.cz); TX FEES + UserDiff; ASIC tested

how long are rounds on slush? and when do they start/end?

is it best to use slush pool for 24/7 mining?

The answer to that is 3 posts up...

how long is each round though? or is it random

You may want to find a Wiki on Bitcoin somewhere and just read up a little. All rounds for all miners everywhere are (essentially) random.