Product review (5 stars): Started working right away.
Although there is a 72 wait period for this to work, ours started working right after installation!  I had my husband install it to replace an old original in our 2010 Whirlpool fridge/freezer.  He installed it in just about 1 hours time and it even has an adjustable speed dial located under the front casing which is an upgrade from the old one too.