If you want to have render times its all dependant on the version of maya your using and the scene file (obviousley) if you want to have render time stats, someone needs to send up a file that we can run to see (as well as stating the version of maya that your using because the newer versions of mantal ray might be generically slower or faster)
Hardware rendering really isnt anything to go by for render speeds as its just the GPU processing everything and displaying what it can, i.e - it will just drop things it cant display, for example anti aliasing, specularity, transparancy etc, if it cant do it it will just disregard it and display what it can.
"No pressure, no diamonds" Thomas Carlyle