This is why I usually suggest you stop for lunch at 12pm. Afterwards you can be skiing on quiet pistes whilst everybody else is taking their turn to eat! if not continue skiing through lunch and have a late one at about 2pm. Then you will enjoy a quiet 2 hours while other skiers are all eating.
Around 2.30pm or later if after a late lunch you can always head for home or even the Sauna ! However keen skiers should continue skiing right till the very last lifts.
Make the most of your ski pass. It’s not cheap. If you have had enough skiing for the day then head for one of the top apres ski spots at about 4pm.