How long does it take your gen5 prime to charge from zero range? Something wrong with my battery?

range is not a fixed number, it is changeable. the epa is a specific test, you shouldn't expect any particular range, there are too many factors involved, only some of which are under your control.
you can get a tool to measure kwh charged, and that will tell us if your battery is healthy.
some public chargers also report kwh as well.
in all likelihood, it is your espectations that are the problem.
there are lots of threads in the gen 4 prime forums that cover this in detail.

 

It's an imperfect world out there, so when you feed a computer more accurate information - it gives you a better approximation. It's as simple as that......

Are you going to be equally upset, when your DTE (distance to empty) rolls over to zero and the car doesn't stop dead in it's tracks or would you prefer it to continue to run?

If you think you have a problem, take it in for service - It's under warranty......

 

here's one experienceunderstanding-the-included-charger.242573

 

At the 12 amp setting - Charging time from empty is about 10 1/2 to 11 hours at 120 volts and 4 1/2 to 5 hours at 240 volt level 2.

There’s also an 8 amp setting that extends the 240 volt time to about 7 hours.

I haven’t used the 8 amp much at 120 volts because I believe it is inefficient and takes about 17 hours.

 

Li-ion does go through a breaking period where it doesn't reach full capacity. perhaps this the case. If so, it will clear up with use.

There are some questions to go over though.
Are you doing trips completely on EV? Maybe the EV mode portion of the battery isn't completely drained.
Where are you, and do you start the charge as soon as you get home? Climate and the battery's temperature will affect charge times. The link in post #7 was seeing a 9hr charge time during a NJ summer.