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@abt
I think upgrading one TF from initial unlock to lvl 15 NON-STOP is possible if you do the following:
- make sure you are always doing all 3 missions and time them (use pigs to speed up if necessary) so you can start the next one as soon if the current one is done
- play 10+ map nodes (preferably with blue or better crystal rewards) DAILY
- earn crystals from weekly events and challenge run rewards
- do not spend crystals on any accessories
- start with a >=50% silo (lvl25) already full
Going from lvl14 to lvl15 will be the biggest crystal sink as you need 10 gold + 20 purple crystals. In terms of white crystals, this is equivalent to 1350 white crystals based on the conversion rate.
Upgrading multiple TF back-to-back is also doable at lower levels. Once you hit lvl13+, then crystals will become the bottleneck.