As Jim said, a couple of months to get appetite back and start feeling pretty good. Around 5-6 months to be fully recovered.
Be very careful of weights of any kind. Unless your surgery was done laperoscoply, you have a pretty big incision. It's not that you will tear the incision, but the chance of a hernia along the incision area is very high.
Walking, walking, and walking are three very good exercises. Just about anything you lift is going to cause some amount of tension on the abdominal area and you just want to be careful.
The weight typically comes back over time, even if you didn't want it to.
Mike
Age 54
10/31/06 dx CIS (TisG3) non-invasive (at 47)
9/19/08 TURB/TUIP dx Invasive T2G3
10/8/08 RC neobladder(at 49)
2/15/13 T4G3N3M1 distant metastases(at 53)
9/2013 finished chemo -cancer free again
1/2014 ct scan results....distant mets
2/2014 ct result...spread to liver, kidneys, and lymph...