How Long Should U Keep A Weave In Help Me With My Sew In Weave!!!!?

Help me with my sew in weave!!!!? - how long should u keep a weave in

I have a fabric sewn in hair and told me that u can perm the ends, while the substance in her hair. Can U plzzz tell me how they care. How often should I wash and condition? What kind of products is used and how often? How long should I stop my hair, before he again?