How long do semi permanent hair colour last?

I have naturally red hair, and I'm going to put semi permanent coloured streaks through it. Does anyone know how long it will last? Like how many weeks?


Thank you =]How long do semi permanent hair colour last?
Ahh i use semi permanent dye. I get annoyed as it seems to fade after like a week.


Ive done purple like 2 days ago and its already fading after 2 washes i feel like i shouldnt wash it lmao but i must.


I would go for permanant.How long do semi permanent hair colour last?
Urmm well it depends on how often you wash your hair but i would say about 4 weeks but it will get lighter every week or so x
Probably around 2 or 3 weeks.
4-8 washes but the colour starts to fade after 2 washes
Semi ???? Then only half the normal time :o)
1 week.
not that long, my friend does this, she has red hair too! hers only last for up to 3 weeks
not sure
it should say on the box
it fades after a while