I usually clarify and do a protein treatment after taking down my weave since i keep it in for 4-8weeks. You hair needs to be strenghtened after all that shedding. 2 weeks is a good time to wait depending on the sensitivity of your scalp too. Between taking the weave down, washing and giving your scalp time to heal from all that manipulation and roughing up i would def inately wait two weeks.
I've gone to salons and see ppl relaxer right after taking down a weave. I couldn't dare try that.