well i'm not as used to this whole hair care thing as some of the other ladies who have been doing it for years are, but this is what i do.
I get in the shower and i wash my hair only, and then i apply my conditioner, and if i have to go and sit under the drier then i go do that (i still haven't washed my body though) i just wrap myself up with my bathrobe or whatever. Then when i'm done deep-conditioning, i get back in the shower, soap my body, scrub and whatever I need to do, and THEN i rinse my hair out.
if it's short conditioning, then i get in the tub, wash my hair, apply conditioner, step out and brush my teeth, or if i have to shave my legs too then i do that, and when i'm done (that takes at the most 10 minutes, cuz i take my time, lol) that's when i get in the shower, soap my body, and then i rinse my hair.
another suggestion would be to shampoo your hair in the kitchen sink, deep condition under the drier, then go shower and do what u have to do, and when u're rinsing your body, that's when you rinse your hair.
HTH