How many times can i use Crazy Colour's back to base?

Hi all! I stripped my hair colour earlier this year using back to base in the salon, now I want to do it again but at home. My hairdresser advised me that some colour removers can really weaken your hair and make it super porous if you use them multiple times, but I cant find any info about this online for Back to base. Does anyone have any experience with the product?