A lot will depend on how many and what size fish the stock back in the lake. A small lake not far from me went through that about 20 years ago. They drained, dug channels depend spots and built all kinds of habitat. When the brought it ack up the stocked with various sizes of mature fish trapped at other state lakes along with thousands of fry. It was fishable in about 2 years with plenty of catchable crappie, bass and catfish. But usually I’d say around 2 years from stocking before they open one up.