I tried my hands on countdown clocks for roll20. The ones so fare is free over at <a href="https://www.dropbox.com/sh/nw5kwspn7204g4b/AADFnv3" rel="nofollow">https://www.dropbox.com/sh/nw5kwspn7204g4b/AADFnv3</a>... So fare there is 4 and 8 part clocks.