Toward the climax of the film, Rikker flys the Enterprise off at warp speed, being persued by the bad guys. When the bad guys catch up with them, a battle ensues, and the Enterprise prevails by dumping the warp core to create some kind of explosion. About the same time, back at the planet, Picard is preparing to face down the bad guy (F. Murray Abraham) and is saved in the nick of time by, none other than the Enterprise, having returned. I didn't do the math, but say the Enterprise flew an hour at warp (faster than light) before turning back. Without a warp core they could no longer fly at warp speed (I'm not a trekkie so there may be some spare warp core the keep in a closet I am unaware of) so I'm figuring at sub-light speed, it would take them months, if not years to get back to where they started.