Depends on how you spend the ingots. There are quite a few good ways to convert ingots into coupons.
1) Jonin medal
2) monthly pack ($6 per month)
3) Lucky wheel. See if you can add $1 everyday instead of a $50 one time. That way you can spin the wheel twice each day ($6/$12 per month)
4) You c*so plunder to get coupons. It its not suitable, then you can do extra SS convoys by spending ingots.

Save these for good deals such as land of lightning treasure, treasure of the sage and such. Saving seal scrolls also depends on how good you are in-game. If you can win matsuri everyweek, get rank on sage battle often - seals usually pile up quite fast.

Combining these, and you may reach the goal sooner than you think.

This post was last edited by Sourav at 2017-3-5 09:46