if it takes you 10-15 doing a single mythic you are doing it wrong. I bought 25 last night and it lasted 4-5min for each one. If you are making 20k per hour please tell me your secret!
If you did mythic 15+ on your 110. You will have ilvl 300+ gear.
https://legion.maskedarmory.com/armory/wow/profile/5af1d52897e1f2629712a060/main
example: https://legion.maskedarmory.com/armory/wow/profile/5af1d52897e1f2629712a060/main. I masked it because i don't want people bothering him.