I’ll tell you that like most (myself included), your old system was watering completely wrong, and not well suited for a healthy landscape.
I have Hunter MP Rotators in my yard, and they only put out about .55"/hr PR, so my grass zones each run for well over an hour. To promote a healthy lawn, you should be putting down .75" - 1" per watering, and in the summer months, should water every 3 days or so. So, depending on what the PR of your nozzles is, those times are probably ok…can you confirm what nozzles you have in your yard?
This website is like the Holy Bible for efficient watering, especially for us here in the AZ desert!