Hello, I believe it is around 8 hours or so before your coins become mature for staking. Now depending on how many coins you have staking will depend on when you will stake. If you have around 20k staking you should expect a stake in around 2-5 days as the network weight has increased a lot over the past few months as the coin price has come down which gives more people a chance to buy and stake. There is a discord server for RAIN, just go back a few pages and you'll find the link.