If you're near Finglas village the train is no good to you. The buses into town are reasonably frequent and there is a QBC on the main road into town. You'd have to transfer to a 10/46A then though. It used to take me over an hour to drive a similar distance so I'd imagine the bus would be about the same - the speed of the QBC would be negated by the change of bus in the middle. Another option is to get off the bus in Phibsboro and get the 10 there. The advantage is that, once you're on the 10 you can doze off/read a newspaper and you're not queuing alongside half the students of Dublin as you would be if you were in town.