15 shards 1 time character quest unlocked at lvl 40
1 shard/day (2 with daily reset if your royal rank is 6 cost 50 visiore)
5 shards/week (frost works 500 visiore)
you can also rarely get his shards from snowstorm ridge choco expedition
600 days if you just do hard quest without reset
300 days with reset (15,000 visiore total)
19 per week with frost works+reset (850 visiore/week)
545/19=28.6 weeks x 850 visiore/week = 24,310 visiore total
if my math is right
however, you are wrong. how many shards does Gilgamesh's second character quest give??? the 1st gives 15. how much does the second one give (FYI, not the hard quest, but the character quest that gives his 2nd master ability)