How long is too long to keep in a deep conditioner? I didn't use any heat... just washed my hair and massaged in some deep conditioner. I placed a plastic cap on my head and went to bed... now I'm at work with a scarf covering the plastic cap because I didn't wake up early enough to rinse the conditioner out and blow dry... eek! I'm all natural (until Saturday)... will leaving in the conditioner for so long screw up my hair? I hope not... help!