The "R" word has come up a few times on "Mike's On: Francesa on the FAN" recently.

Longtime WFAN host Mike Francesa has speculated that his retirement may come sooner than fans think.

"We're in different places right now," Francesa said of his relationship with CBS Radio on his Friday show. "We're on different roads and the two may never meet again."

Francesa added that he's not 100 percent certain he will last on WFAN through the 2015 NFL season, but he "most likely" will.