Hello. In all the literature that I have read, momentum portfolios are built around 1 year look back period. People have done a lot of research to confirm that not much changes for lower time periods. The variations include 12m look back or 12m – 1m look back etc. I have used 6m also to provide some recency bias.
What changes is the rebalance frequency. For large caps rebalance may be done over a one month frequency while for smaller caps, it might be better to do it more frequently.
I do my rebalance every week to negate effects of big volatility. I am invested in several smallcases operated by other Managers. They also follow similar practices.
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