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It may fade, which I suspect is what you're thinking. That depends based on your hair and your lifestyle. I have mine dyed red, it looks rich and glossy for about 2 weeks then starts to go orangey... but I wash everyday. Red is the worst for fading - brown and blonde are better but will start to look jaded and dull, rather than not being there anymore.
The permanent colour will stay on your hair until you cut it off! It may fade. After about 4 -6 weeks your new hair will start to grow in and your roots in your natural colour will start to be noticeable depending how grey your are, and then you can have an appointment to do your roots only. I wish is never started colouring my hair! It's a huge time commitment and a faff to do. I think permanent colour is worse as with highlights the roots are less noticeable.
I am using a semi-permanent which covers grey called 'Natures Grey Busters' as I seemed to be having a reaction to PPD in permanent colour. This covers my grey well, and I think will be ok until I retouch my roots about 3 weeks after having it done. It lasts up to 8 shampoos. I paid about a fiver for it, but I need 2 for the length and thickness of my hair, though I am hoping to get away with 1 pack for my roots.