Good news if you're selling in Michigan: we're in the fastest category (median days on the market is under 30 days). I just listed a house that received 5 offers in the first 3-4 days on the market and that's fairly typical.
Here's the link to the map from the National Association of Realtors if you're curious what the rest of the country looks like in terms of median days on market:
If you're interested in a very detailed analysis of the current national market, check out this report from Realtor.com:
Hope this is helpful/interesting for you. Let me know if you have any questions or there's anything I can do for you.