PER DAY
Basic Crafting 1000gp
Mythic Path ability - Crafting mastery with the feat +1000gp
Valet familiar (coop crafting) +1000gp
Mythic path ability - Mythic crafting +1000gp
Wizard arcane discovery - Arcane Builder - Reduce build time by 25% (granting an additional 1000gp at full build)
With a FULL mythic progression this can be accomplished around level 4. But that is completely concentrating on crafting. No combat feats, metamagic feats or anything else.
That is without using tools of amazing manufacture or 3rd party mythic feats that can increase that further.
It also assumes that when an ability says it "doubles the progress" that it actually referring to the base speed not additional abilities.
Crafting mastery - "you make twice as much progress on the item for any time spent"
Mythic craft - "Double the progress"
Cooperative crafting - "your assistance doubles the gp value of items that can be crafted each day"
As it gets difficult to decide what is doubling what and because of prior conversations I think just doubling the base is the best way to do it. Otherwise that number becomes 8k or 16k PER DAY. Which truly is extreme.