Its only about 5 or so direct on the train isnt it?
There are 3 options in getting from Amsterdam to Bruges:
Change trains in Antwerp and again in Gent: 3 hours 31 minutes
(The first leg of this is sometimes on the high-speed Thalys train, and you have to get a seat reserved for it, which you can usually do the day before or even as you walk up)
Change trains only in Antwerp: 3 hours 44 minutes to 4 hours
(This is a bit slower because the connection between is longer)
Change trains only in Brussels: 4 hours
(This is also slower due to a longer wait for the second train)