HOW TO find peak and off-peak traffic timings between locations

To know peak and off-peak traffic timings between locations, use the "Depart at" feature to know typical traffic patterns at different timings possibly based on historical data

One scenario where this feature can be useful is when you're looking at new places to live & want to find the commute time for different options

Bing Maps has this feature too...

but Google Maps is one up with its "Arrive by" feature which will do the math to tell you what time you have to start if you have to reach a destination by a defined time.