I currently have a longer-term buy/hold strategy which isn't set up as an alpha. Just monthly coarse/fine universe selection, criteria for liquidating a stock, and monthly rebalancing.

If I want to rework this strategy in the form of an Alpha, what's the max period I can set for the insight period? Can timedelta be in terms of months or years? Most Alphas I see are shorter duration (minutes).

Thanks in advance for your help with this!