How long can you leave a car parked in the temple lot? (assume you do attend a session and desire to leave the car for a while).

Just make sure that you have the parking ticket stamped. Then your parking will be free.

There isn't a limit but if you need to park overnight let security know.

I was able to leave mine overnight since I was coming back the next morning for another session. I couldn't find security before leaving so I left a note on the windshield with the parking pass.

What Mike said

Check the schedule . You'd probably have to leave at the end of the last session.

Once i needed to leave overnight.

I dont think there is a limit if you are a patron of the Temple.