It's impossible to give an arbitrary number for how much volume you should be able to handle, and especially not if you use tonnage. Intensity will greatly affect how much volume you can handle, if you are working with 60% then you will be able to do a lot more than you would with 90+. Also, proximity to failure. A max effort set will take a lot more out of you than triples with 70%. Better to count either sets (if you normally go close to failure) or total reps if most of your volume is submaximal.
This video is long, but nothing else will give you a better answer: