Apollo 17 launched at 12:33am on Dec 7th 1972, and entered lunar orbit at 2:47pm EST on Dec 10th, so, roughly 3.5 days. Artemis I launched at 1:47am EST on Nov

Apollo 17 launched at 12:33am on Dec 7th 1972, and entered lunar orbit at 2:47pm EST on Dec 10th, so, roughly 3.5 days. Artemis I launched at 1:47am EST on Nov 16 and entered lunar orbit on Nov 20th at 2:09pm ET so roughly 4.5 days. Remember too that Artemis I isn't meant for a landing, instead it entered a distant retrograde orbit which orbits at a considerably higher distance from the surface. Spacecraft move considerably slower at higher apogees, so I don't think there's anything suspect about Artemis I taking a bit longer to reach it's planned orbit around the Moon.