For how much time do you usually let your money invested in a casino before finish or renew it?
There is not specific time in doing it, you can only estimate it based on the performance of the site. By setting up a goal in terms of profit and loses, you can make a good decision on what to do with your investment. It is not automatic that you will profit from gambling sites investment, there are sites that does not perform well, thus you have to divest your investment and transfer to a more active sites.
If you invest money in any site, you should keep on track your investment not in a daily basis at least 3 to 4 days you have to check. Becasue the site's performance are not always same, the profit giving sites will run in loss sometimes. In that time if it continues long term we have to move our funds to another reputed sites these are the problems we face in investment.