Hi
You can never determine the exact time , a tank takes to mature. The
only solution is to invest in a good test kit. Once the test results
show Zero for Ammonia only then can fish be added to the tank. Since
you have already added fish it is best to monitor the parameters very
closely. Please do not introduce any new fish, add any kind of starter
liquids now, overdose the conditioner or the worse please do not give
your fish to any fish store or a friend at this stage.
Try feeding sparingly and closely monitor water parameters. You might
have to keep up with the water changes.