Day 1 is 40 levels of 15 minutes, so 10 hrs of play.
Add 10 breaks of 5 minutes, so in total it will take about 11 hrs to finish day 1.
I've hardly ever seen (if ever) the bubble did not bust on day 1, but you'll find that out yourself.
Taking notes obv is a good idea, but you really have to write down at which level you are when you do so.
For example,if you meet a player in level 30 and you've been at the table with him/her in the early levels, the notes you made there are pretty useless (assuming the player adjusts to blind levels and stacksizes).
Than, if you make it into day 2 (hope you do), you have plenty of time to search other players at OPR or some site like that.
I might be wrong, but I don't believe there's a new seatdraw before day 2 starts (not sure about this), so you can at least search for the players at your table.