Depends on how much you put in it and how fine you grind.
Three basic parts to the equation, Grind Dose and Tamp. Also Basket size plays a role here too as baskets vary as do shower screen heights.
"Normal" Tamp pressure is considered 15kg.
Dose, best to stick with a weighed dose while you are getting things settled. 14g would be a good place to start.
Grind, adjust to give the desired run time of 25-30 seconds - 60ml. Check for blonding or other problems.
Then adjust only one variable at a time is the important thing and taste to see if it improves.
If you grind finer as I am currently doing at home you can pack more into the basket, but to keep the shot pulling at a sensible pressure on the Pavoni then I am using a much lighter tamp to compensate. Tamp pressure is more like 5kg I guess but the shot tastes better so I am playing with that. Current dose is 17-18g in a basket designed for 14-15.