For recent experiences, get the Plugshare app and read the comments. Somebody usually comments on where the restrooms are and what the food options are, as well as which chargers are working well.
You can calculate the theoretical charge times by looking at the charge curves (Google it). I spent hours planning our first 1000 mile road trip and made an elaborate spreadsheet. But in the end, we used the Tesla nav and charged enough to get to the next supercharger(about 2 hour drive away). By the time we plugged in, walked to the restroom and returned, we were ready to leave. Each charge session took 15-20 minutes. I threw my spreadsheet away.
The most efficient way to travel, time wise, is to drive as fast as you dare to the next supercharger, arriving with as low a battery % as you dare. Your battery will charge the fastest when it's low in charge.
As someone else noted, chargers are numbered 1A, 1B, 2A, 2B, etc. Both #1 stalls use the same transformer, the #2's use their transformer, etc. This means power is shared between the same number and will be cut in half if the A and B of the same number stalls are occupied, so try to spread out.