Jump in whenever and watch what i missed afterwards.
I missed the first half hour of today's stream but i already know that
It depends on what they are streaming and how much entertainment I think it's going to bring. I usually want to see beginning to end if I think its going to be great. Otherwise jumping into the middle and/or doing stuff on the side is no problem.
Tonight, I came in a few minutes late and then proceeded to fall asleep for most of it (had it on my TV/second monitor). I awoke to the craziness of lazerdisc's or whatever that was. I am stoked to download and watch it whenever it is up.
I usually download them if I've missed a significant chunk and watch what I missed and skip what I've seen.