You will only need one small tub of Timbermate...
I have a small tub that must be at least five years old now and I haven't used a quarter of it...
As Tony said, a little bit goes a long way.
When you go to use it, thin it down with water until you get a thick cream consistency then use a rubber squeegee or an old credit card to scrape it on.
I apply it across the grain, working both directions to make sure it gets in.
Let it cure over night and sand.