In Aliens (1986), the occupants of the Sulaco are in "hypersleep" for the journey, but how long did it take? When Asked how long before they would be overdue Hicks replies 17 days, presumably plus travel time extending that. If they journey would take months, then any rescue of either the colonists or the marines would almost be pointless.
The script is pretty clear on this one.
CUT TO: EXT. DEEP SPACE - THREE WEEKS LATER.
The novelisation also agrees (in several places)
Ripley’s outburst sparked no more conversation than that as the troopers finished breakfast and retired to the ready room. Ranks of exotic weaponry lined the walls behind them. Some clustered their chairs and started an improvised game of dice. Tough to pick up a floating crap game after you’ve been unconscious for three weeks, but they tried nonetheless. They straightened lazily as Gorman and Burke entered, but snapped to when Apone barked at them.
I'm pretty sure there is not a definitive travel time given in Aliens, but there is one in Alien. After the Nostromo takes off from the planetoid, Lambert announces that, with the damage the ship has sustained and the fuel they used up, it will take them ten months to reach Earth. This provokes a round of grumbling, and it is obviously longer than it should have taken to travel that distance. Moreover, the Nostromo is a commercial vessel, not a military one on an emergency mission. So we can pretty safely say that ten months is an upper limit on the Sulaco's travel time, which is most likely a matter of weeks or months, unless it uses qualitatively different form of faster-than-light travel than the Nostromo.