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Depending mainly on how is your body used to training and the intensity of your training.
For example my workouts are at least 20 sets for each bigger body part, a bit lesser for related smaller bodyparts, changing the structure of the training every other time, generally it takes approx 2 - 3 days for a body part till the after workout pain fades off. If I experiment in my workout and try new exercises, it may take more.
Arms or shoulders, as a small body parts, in general recover faster than bigger body parts such as legs or back. Also muscles that are used to major workload (abs, calves) recover very fast. It's not that you can't train until the after workout pain fades off, but in general trying to wait at least 2 - 3 days between the same part workouts.
Btw. if you maintain a solid nutrition and sleep regimen the chances to overtrain are absolutely minimal, think of the workload pro athletes do while keeping a rigorous nutrition and sleep regimen. It's not really overtraining, it's more like that muscles need rest to grow and if you won't give them that rest you are likely to stagnate when it comes to power or muscle building (you may increase their work capacity though).
I'd also strongly advocate to work on a complete body. Whenever there's the frequent visual of guido type guys with big arms, no definition, no shoulders and no legs in Jersey Shore type T-Shirts just about anybody serious about working out will chuckle.
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