One can think about it as follows: the front-running interval is the amount of time that has to be waited for, from an economic perspective, to prevent front-running the price feed. From a holistic perspective, you have to meet the economic constraint but also the technical constraint of the update only happening at the on a period. Overall, both the technical and economic constraints need to be met. In the case of an 8h SMA, 1h rebalance period, means that you have to wait (at minimum) to fulfil the economic constraint (8h SMA) and, if you are unlucky, also completely wait for the technical constraint to be fulfilled, i.e. waiting another hour on top of the 8 hours.