loose no.1
take even longer on no.3 that you think you should
Yes, I agree with the above, but with No 4 you don't have to be over zealous. A few drips from an upstairs window will not affect the quality of the clean on the downstairs window.
I'd also say when you practise on your house or your families; after you've had some practise, attempt to go as quick as you can; do what you think maybe a shoddy job; just once over the glass (top frame if it looks like it needs it), rinse and move onto the next window. Try to get it to about 15 seconds per standard window and see what the results are like. The same with patio doors, just wash once and give a quick rinse. It takes very little effort and time.
I once did my own house like this early on when I started WFP and was amazed that they came up great and that gave me the confidence to work fast.