Brown hair to blonde hair?

I want to dye my hair blonde kinda like the pic and my hair is brown, mixed with a VERY faded red cause i've dyed my hair red and then red again and back to brown. i'm going to get it done in a salon but i'm wondering how expensive it is to go from brown/blonde? will there be more then one session? cause i'd rather just get it over with and not have to pay a lot of money for more then one session. the pic is below