Yup, that's definately strain dependant.
Sativas have long and skinny finger like leaves. Givin space and proper conditions they can get to be as 85cannabliss said, 15 feet and i've even heard of taller!
Indicas have fat-shorter leaves. They givin bad or good conditions usually wont get higher than 4 feet IME. Indoors i think they even get less than that but i'm an outdoor grower.
If you do happen to have a raging sativa or even a weird raging indica that wants to clime to dangerous heights, you can tie your plant down.
I heard it gives a little stress to it, but not much. Just take it and pull the top of the plant down to a nice bend, not in a breaking mannor, and tie it to hold it there. It'll start to grow sideways and eventually try to grow back up, but then just tie that part down and you should be good to go. hope this helps
~Burn One~
Dewayne