Yep you can't really watch it for 24 hours non stop it would put you to sleep lol. The fun is the entire event, waching night racing with the exhausts and brake disks glowing going off having drinks meeting people, than back to watch some more racing etc. I went to the british GP a few years ago and as I'm use to endurance events I was surprised how quickly it finished.
I queued for 2 hours to get there. Got in, the race started, I got a coffee and burger found a good place to stand and then the race finished, then 2.5 hours queue to leave the place, terrible.
Last time I was in the ring I was on the track so I can't imagine it'll be any where near as much fun to watch as to race but still a laugh in anycase.