How long does a Class 1A Flight physical take to be returned to the Soldier?

Depends on your access to a flight physician. Usually any physical takes about 2-4 weeks. But if you don't have access to a flight physician it could take months, especially if they have to send it to Rucker.

My flight physical took about one month before I got the results back. You can check with the provider who did your physical as they should be able to look up the results as well., but I would wait at least a couple weeks.

What SFC Boyd said. I knew a crew chief who got it back in a about a week but he was already on flight status.

https://vfso.rucker.amedd.army.mil/
go to that website and login and use the "Service Members Access is now available.
You can request access to your own flight physicals here." you can check on it yourself as well most of the time the provider wont inform you about it until later but I checked on mine and you can print everything from there to the ETP, the physical, etc.

I submitted mine back on January 24th and got it back by February 12th. So a little over 2 weeks. The bigger pain was getting my Group Surgeon to sign off on the form 3.3 (I think?) that goes into the final packet.