<30min, <60min, <90min, and 90+min isn’t very accurate for me. Perhaps it would be more useful to a) list time estimate with what two or three common w/kgs would generate on the route (e.g., @ 1.5, 2.5, and 4.0 or whatever w/kg); or b) autogenerate an estimate based on the route and a person’s ftp, average power, weight, etc., as this site does Zwift Route Time Predictor