Once a week I DC on dry hair overnight. The rinse, moisturise with oil,finger detangle( if my hair isn't braided) and plait takes about 30 mins max.
Once a month sometimes I go longer between wahses, I use clay/henna for a cpl hours(henna overnight), rinse, oil wash, rinse, airdry overnight. Depending on my mood I will either DC, then moisturise and style or just moisturise and stlye.
Sometimes I will oil my braids the day before a DC/wash day. But since I don't use a traditional "poo(giggle)", I wouldn't call that a pre-poo.
I don't section to wash or rinse. Clay application takes 30 mins including mixing the clay, but excluding making a hair tea to bind clay though.
I will also spread out both routines over days if I don't feel like having a hair session.
MIght sound time consuming but I'm usually doing other things(sleeping, cooking, watching tv) so it never feels like I have spent hours on my hair.