Yes, you are right, momentum generally persists for about 4-6 months, which aligns with the half-yearly rebalancing schedule of many momentum indices. This frequency helps capture the ongoing trends while avoiding excessive trading costs. By rebalancing every six months, these indices aim to stay invested in stocks that are currently performing well, based on the momentum factor, while periodically adjusting to reflect changes in market dynamics.
Personal pf rebalance I use to do monthly basis, but checking stock prices weekly.
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