Peter Dreher has "painted the same glass more than 2,500 times at night and more than 2,500 times during the daytime" since 1974.

From: https://en.wikipedia.org/wiki/Peter_Dreher#Tag_um_Tag_guter_Tag_/_Day_by_Day_good_Day via https://mobile.twitter.com/tophtucker/status/1150517103298011139