Here's another view: Don't worry about minimizing stop time.
Instead, focus on making -good use- of your time off the bike and your stopped time.
- Before you go into a store, take a moment to collect your wits and decide what you need.
- Try to make only one trip into a store - Take your bottles and avoid long lines, If you're waiting a long time to pay, go ahead and start eating/drinking your purchases.
- When you eat, sit down and get a little recovery when you do so. Loosen your shoes.
- If you're waiting for a friend to fix a tire, lie down and rest. ( Spencering )
- Later in a ride when you're tired, it can be faster to walk a steep hill rather than riding it. Pick a landmark on the side of the road and walk to it. It's hard to eat and drink while climbing, so stretch your legs and have some water. I find that I ride a bit faster after a walk break.
I once asked Deb Banks if she had advice for a new rider - she said 'Take off your shoes whenever possible"
Bonne Route!