Depends on several factors, namely, the number of transfers to your wallet, the size of each of those transfers, and the number, size, and age of the coins being staked from the rest of the network. It'll start out slow but it's aggregate, ie, the more you stake, the more weight you have with the network and the more times you'll stake. less than a week after my first deposit i ended up getting four rewards in one day totaling over 8.25% of my total, which makes up for a slow start.