I have made the following changes to Artificer since we do a lot of downtime to create magic items in my campaign. I had added a 5th level feature to reduce the time for common and uncommon and updated one at 10th level for Rare and Very Rare:

Magic Item Capable:
5th level artificer feature
You've got the initial grasp on making magical items:
If you craft a magic items with a rarity of common or uncommon, it takes you half of the normal time.

Magic Item Adept:
10th level artificer feature
You've achieved a profound understanding of how to use and make magic items.
You can attune to up to four magic items at once
If you craft a magic items with a rarity of common or uncommon, it takes you a quarter of the normal time, and it costs you half as much of the usual gold
If you craft a magic items with a rarity of rare or very rare, it takes you half of the normal time.