Yes, it will increase your tolerance, but by how much will depend greatly on what you do with it and how your tolerance already is. I find that I don't need more than a couple days to get my tolerance down to a reasonable level after a very heavy hash oil session.
There is only one way to find out for yourself; just buy the hash oil.
I like to put at least a ballpoint pen head size amount on a bowl whenever the herb isn't "top shelf". Hash oil taste good, but can ruin the taste of "top shelf" herb pretty easily as well, thus the reason I recommend using lower quality herb to smoke with it. Or you can buy a concentrate pipe and smoke it by itself, but that can and does get expensive.
I love smoking hash oil. You should try it.