I changed my search terms and came up with some better info. According to the city of Minnetonka website, the big public access at Gray’s Bay *should* be open 24 hours.
I say *should* because it seems like the DNR and municipalities that operate boat launches are awful at providing actual, concrete info. The best I could find was an “operations plan” for the marina that’s dated 201 that states “there will be 24-hour access.”
So I guess I’ll find out if there actually is?