If my grass is at 6 inches high, and I cut it down to 4 inches (using
the 1/3 rule)...
...how long do I have to wait before removing another 1/3???

In other words, can I remove a third, and then turn around and cut
another third?
Should I wait 24 hours before the second cut? ...48 hours?

My lawn tractor is in the shop and my grass is getting tall. I want to
over-seed the lawn this Fall, but I need to cut the grass down to about
2 inches before sow the seed.

Thank you very much!
Dave