[mura_gadi (Steve)]

A few things come to mind.

Its a test mission, right down to the commander dummies etc, may as well have a long time for testing purposes.

Artemis will have a capsule that can sustain a crew for up to 21days, Apollo did not have this luxury.

Artemis is using a gravity assisted approach and a two stage system not three stages that Apollo used.

I'm sure other will already be in the know or find a link to what's what though.

************

One from the interweb
"Apollo burned a lot of fuel in exchange for a quicker mission. Back in the 60's the spacecraft had a very short lifespan, mostly limited by the capacity of the batteries. Nowadays battery capacity is much better, and so is solar panel technology, so missions can afford to spend an extra few days in exchange for saving on some fuel (weight).

If you look at unmanned probe mission to the moon, some take fuel economy to extremes, and take weeks to get there. Roughly speaking, you can get to most destinations in the solar system on very little fuel if you are prepared to wait (sometimes many years) for the right launch conditions, and can tolerate very long flight times."