Okay so we will get 400 (150 guild task + 30 shard from guild task + 120 for the color dungeon + 70 for sunday + 30 for shards) free diamonds by week. So 10 weeks before doing a Mythic…
With the Sunday gem pack (80 diamond for 50 gems by week) it’s reduce to 9 weeks (8.3 exactly).
With everyday gem pack (80+120 diamonds for 350 gems by week) it’s reduce to 7 weeks (6.7 exactly).
With both Sunday packs (80+150 diamonds for 50 gems + 5 dollars by week) it’s reduce to 7 weeks 6.3 exactly).
With everyday dollar+gem pack (80+120+150+300 diamonds for 350 gems + 35 dollars by week) it’s reduce to 4 weeks 3.8 exactly).
It means for free every 2-3 months you can craft one Mythic. It seems to me reasonable.
If you want exactly 2 months for 4000 diamonds (I assume here 2 months = 8 weeks), you need to take 8 times the Sunday gem pack and 8 times any other day gem pack so 800 gems on 8 weeks or 100 gems/week.
My advices if to altern every month between:
- Mythics hunting with ressources (2288 glory + 360 gem keys (EDIT: thanks @Mithran) + 12k seals + 2320 gems (I assume you use only 100 gems by week for diamonds)) (so stock them during 2 months)
- and crafting.
I still don’t understand why no dev explains what I say in the 1st paragraph…