Whatever the 37th hour of your highest traffic is -- that's what you will be billed.
A good host will make an exception and say - yes you were charged 100+mbps and your traffic lasted for 2 days - so lets make a deal.
But why go thru that hassle, if you expect to submit and get huge spikes over a couple days and then much smaller traffic, go for the per gig and save everyone the headache
