If you're doing a three day split then you definitely need to be splitting up back and legs. Ideally, you want atleast 48 hours between muscle groups but many would argue 24 is sufficient yet others will say aim for 72. Just don't work the same muscle groups back to back and you'll be fine.
Remember, that just because you aren't targetting a muscle group, doesn't mean it isn't being utitlized.
Do something like:
Mon: Chest/Tris
Wed: Legs/Shoulders
Fri: Back/Bis
That is 48 hours rest your shoulders should get from your chest workout the previous Monday. Ultimately, you need to get in touch with your own body and decide how much time it takes for you to recover.
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