I rate my solo rides in several ways:
STR (Smell The Roses) rides are normally taken on the touring bike, length varies from 35 to 60 miles or so, and average speed will range from 15 to 17 depending on terrain and wind. These typically get a rating of 3 out of 5 stars on my Sigma Data Center log.
EZ/Recovery rides, usually on the road bike, range in length from 25 to 45 miles, at 16.5 to 18 average. These also are 3 star rides.
Training rides will be on the road bike, between 25 to 45 miles at 17.7 to 19.5 average. These can get a 4 star rating if over 18.5 average.
Best so far this year was 21.03 miles @19.23 mph average.(Gettn' old........)
It has been about 7 years since I have hit the magical 20 for 20 ride. I may never see that again on my own..... THAT would be a 5 star event!!