I think you've already answered/clarified the answer to the question I'm about to pose, but when you said that it took you 90 minutes to ONR your car--was that your first time using it?
I recently converted to ONRing and my first time took me slightly longer than a traditional presoak & wash : ~90 mins.
2nd ONR wash took me like 35mins.
3rd ONR wash: 25 mins.
After the initial learning curve, the process is usually quicker than a traditional wash, as I'm sure you've learned

. And the results are outstanding. I love it for my weekly/maintenance washes, plus my in-between-polishing stages etc washes. The gloss is great, too

.