I take mine every morning and leave the thermometer in by bottom for atleast 5-10 minutes, sometimes longer if I have the time. Depending on what's happening during the day, I may take a "lunch time" reading. I also take mine in the evenings before bedtime. Unfortunately, I have no one to take it for me except my MD and Gyno who agree with me that rectal is the most accurate, but have to wait until I have my annual appointments, or if I am really sick.
I am usually laying down on my side or stomach on the couch or bed, sometimes bending over a chair or counter.