So if I place a 10M order GTC for 60 days with a $9.95 commission and that order is filled over the next ten trading days at 1M per day, do I pay only a $9.95 commission or do I pay $9.95 x 10?

If its the former, buys over several days with one commission is a great feature.

"Etrade does one commission for the 60 days GTC order, so you can have a partial fill on the first day you place the order and have the remainder filled on a seperate day within the 60 day period."