I may wear twists for the fall and winter--if I don't do cornrows or plaits beneath wigs (thinking about doing a set within the next week to start my yearly fall/winter PS chall early).
I have never twisted my whole head in individuals. I usually do flat twists in the front and the back in individuals (medium sized like the size of a fat crayon). I just grab pieces in a row and start twisting (so that I don't have permanent parts). I leave mine in for about 4 wks (actual twists in 2-3 wks, then curly twist-out or puff for the remaining time).
I always twist on freshly washed hair, then after I sit under the dryer 30-45 mins to dry the gel and set the twists (I usually wash at nite or late evening, and so that the twists don't dry smashed or flattened while I tie them down and sleep, I dry them 1st).
I only have to re-twist a few maybe once every wk or every other wk. I use Shea Moisture Curl Enhancing Smoothie and some kind of moisturizing gel to "set" my twists. I've never CW or washed with them in...this is something I would like to try. For maintenance I oil my scalp a few times a wk, spray on a leave-in moisture mix, use Shea Moisture Hold & Shine spray, then top w. an oil spray like Garnier Fructis Nutrient Spray.
When I re-twist I add more smoothie to the ends, shea butter mask (Shea Moisture's Deep Treatment Mask--have used since Feb. as a twisting product), or the Shea Moisture Curl Milk. Then, as usual before bed I spray my stuff on to retain moisture (noted above).
I get good growth from them and my hair curls up nicely at the ends so they dont really unravel. I love the ease and low-maintenance aspect of wearing them. I just HATE sitting for a long period and doing them! UGH Oh yea, at nite I tie down the front w. a satin scarf, and add a flat edged satin bonnet on top (no ruffled elastic edge to cause breakage) to the back to enclose the hanging twists.
Pics in my fotki (address found in profile). I've only done twists on my hair twice since becoming fully natural Jan. 2011. This set I want to do (but can't summon the energy to) will be my 3rd. HTH