You should be able to up the weight a little every session for quite a while assuming you are eating enough. The stronger you are to start with and the less you are eating, the less time you'll be on linear progression.
I've just moved to twice per week increases, instead of thrice, on the squat at 157.5 kg for 3 x 5. That's about 14 months of training from an empty bar.
Like Dave said, stay on linear progression for as long as you can, it's the fastest strength and size growth you'll ever see.