Free hand-washing timers

You can order up to 3 of these. I thought this timer was a great idea for my Grandaughter who teaches a small group of pre-schoolers at her Church. This might make a fun learning activity. The children could trace their own hands on paper and draw “germs” on one hand in the drawing (the dirty hand) and leave the other one germ free to show the clean hand. They can then take that home to hang near the sink as a reminder to wash their hands. I could also give the class members some of my Johnson’s Buddies Soap stash to take home. Would this work for home schooling, too?
I am also thinking these might be a good idea for anyone who works with special needs, or in assisted living who may need to spend a bit more time on the hand washing.