I am designing a fund-switching strategy for my 401k account with fidelity.I have a 30 day rule for holding funds, so i am trying to capture those longer moves in the funds. I can switch from one fund to another no more frequently than the 30 day limit. My system is fairly simple.Just a combination of price rate of change and a indicator that measure's how smoothly price is trending.I am unable to really measure what the optimal lookback period should be for the time frames i am trying to capture. I am thinking somewhere between 3-6 months, but would be curious if others have done this and have some feedback they would like to share. Thanks for listening.