Win totals for franchises last time they went from 25 or less wins to 50+ within ten years or fewer
Atlanta 13, 26, 30, 37, 47, 53
Boston 24, 66
Brooklyn 16, 31, 26, 52
Charlotte 20, 19, 26, 31, 44, 41, 50
Chicago 23, 47, 41, 49, 33, 41, 41, 62
Cleveland 17, 35, 42, 50
Dallas 24, 20, 19, 40, 53
Denver 17, 43, 49, 44, 45, 50
Detroit 20, 28, 46, 54
Golden State 23, 47, 51
Houston 14, 29, 48, 51
Indiana never made that jump within a ten year period
LA Clippers 23, 19, 29, 32, 40, 56
LA Lakers 19, 33, 25, 36, 54
Memphis 22, 22, 24, 40, 46, 41, 56
At which point, I lost interest. But I think there's a decent chance that if you go from rock bottom to at least a borderline contender, you're pretty likely to spend at least a few seasons on the way up with wins in the 30s and 40s.