How long does the hair coloring you get from Hot Topic last?

i was wondering, because i want to add some blue streaks in my hair, can anyone who has tried it, tell me how long it stays in?How long does the hair coloring you get from Hot Topic last?
I just got some of that stuff if your getting the ones in the little boxes that says temporary it comes out the next time you wash your hair that's as long as that stuff lasts.How long does the hair coloring you get from Hot Topic last?
It lasts about 20-30 shampoos, and that lasted for me about 6 weeks. It will still have a light tint even though it says its supposed to last not that long.
If you wash your hair everyday, usually 4-6 weeks.
If you wash your hair every day with shampoo. it should probably last two or three weeks until it noticeably fades.