Definitely it depends-
Taken from the westside-barbell.com website (June 01; L. Simmons):
The muscles can be trained very hard and often, large muscle groups every 72 hours and smaller muscle groups every 24 hours or less.
There's a lot of scientific study that back this as the optimal muscle recovery window.
On the other hand, the Russians are often believers in high volume training and may squat or bench 4x-5x a week. This is because there are other factors besides frequency:
intensity- how heavy and for how many sets? Fatigue is greater immediately after a maximal lift but recovery time is shorter. Immediate fatigue less but recovery longer after higher reps sets.
experience- do you have the conditioning and neuromuscular skill to handle increased workloads. In other words - beginners shouldn't apply.
exercise selection- frequently changing exercises reduces fatigue
Of course their system is primarily designed for strength training. I don't know how effective the application is for bodybuilding. (This is something I've often wondered.)
If you want to train more frequently a few basics to consider:
Don't jump in right a way. Start basic and add an exercise or 2 when you're ready.
Keep it short and simple. No long fatiguing sessions.
If the weights start feeling heavy you need to back off.
You can also cycle: heavy work followed by a few lighter days to recover.
It doesn't hurt to miss a day or two if you feel you need it. It's simple math- 2x a week is 112x a year. 4x is 224. A smaller % of your actual time will be missed.
This type of training isn't for everyone. Some people just do better with less frequency.