There's no specific answer. If a rather simplified answer is to be given then for three (3) stage acclimation days required is 7+7+7 or 6+4+4 as some others have put it.
But, it depends on whether you are entering for the first time or are re-entering the HAA ( High Altitude Area)
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But there is a concept of intermittent acclimation or rather Intermittant Hypoxy Exposure (IHE) also, but I think it is a suboptimal solution as the detrimental effects will not be noticable until you have accended. Whereas with 3 stage acclimation, adverse affect can be observed during each residence time and thus remedial measures can be provided.
If going for IHE, I would also ensure availability of HAPO bags/chambers and oxygen supply is plentiful in HAA.
But, coming to a rather realistic pov, it also depends on the activity to be done. Soldering is a serious activity. But, then if your purpose is propaganda? You might have seen bikers do Pangong Tso trip with 2-4 days of residence time after landing at Leh airport. So, ultimately your call how you look at it.