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You need a minimum of 3-4 days at Baikal to actually feel something about it.
In that time you'll manage to get to the lake, spend a couple days driving around the shore, look at the water and understand what it's all about. If your time is really limited - 2 days will somehow work, but it'll be more like just checking it off a list than an actual rest.
I usually recommend a week, especially if you're coming from far away - you can hang out in Listvyanka, take a trip to Olkhon island, and just soak in the atmosphere.
I went there in the middle of summer and realized that three days is really not enough if you're not local. The first day gets eaten up by travel and adjusting, the second day you're only just starting to get oriented, and by the third day you're already packing to leave - it's frustrating. Better to set aside at least a week, but if you're really strapped for time, here's a good move - book accommodation in a village that's easiest to reach, and don't bounce around to different spots on the lake. Stick with one base, but then you'll actually have time to walk around, soak in the atmosphere, maybe even swim, instead of just rushing through the sights.
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