A woman should never invest in a relationship she wouldn't want her daughter in, nor allow any man to treat her in a way her son would get scoled for.
People are not reading. If that is 7/7 normal then you did 6 on heroic, that doesn't add up to 15 kills on a single difficulty. Its designed to be unlocked if you don't repeat any bosses after 3 weeks, but you can currently do it immediately if you're willing to kill bosses without loot.
I killed 11 HC bosses in the first week (6+5); and 10 in the second week (3+7), and got my Mythic-reward-mission a few minutes after triggering the raid-mission in the middle of the second week. So basically: if you really want the mythic mission just kill enough bosses on HC (even though you no longer get loot).
1; you need 1 645+ ilvl follower for the mission to show up
2; 15 kills on normal -> heroic cache;
15 kills on heroic -> mythic cace
3; internal CD is around 2 weeks
I had one extra normal kill, because I've helped my friend kill Normal Imperator, +2 full resets -> I've got HC cache.
My guildies are all at 14 heroic and 14 normal kills, all of them got normal cache. A few of them went to heroic trash farms and killed Kargath -> 15 heroic kills, they've got Mythic cache (one of them got a wf trinket.. nice)
Update: If you have a 'Normal' cache mission (kept mine for a few days), it won't change despite you killing 15 HC bosses (just killed 15 total) - seems like you have to wait for the next Garrison mission to show up.
So I've got
3x Kargath
3x Butcher
3x Tectus
3x Brackenspore
3x Twins
3x Ko'ragh
2x Imperator
Heroic kills. So my next one should be Mythic if I'm not mistaken?
Chronomancer Club
This is great info. I had been wondering about it because I, too, got the mission before getting 15 kills on normal and thought to myself "do I need to run one more Kargath kill quickly to get to my 15 kills before starting this mission?"
Also, anyone know what happens once you have 15 normal kills and 15 heroic kills? Say I have 20 normal kills and 16 heroic kills. Would I get heroic loots or mythic loots? Is it a once-you-pass-the-heroic-kills-threshold-you-get-mythic-loots-always thing? Or once you pass both thresholds you get loot for whichever bosses you have killed more of? I certainly hope it's the former since the later would really discourage me from ever joining a normal run again!