How Long Does 99 Dungeoneering Take from 1 (average Time)?

Hey, right now my Dungeoneering is 15, but I'd expect people to have better photographic memories from when they started that a random level from 1 through 99 Dungeoneering. I've seen responses to this question such as it depends this or that. So to make it more in general, can someone who has known or who has 99 or higher Dungeoneering, tell me about how many months/days they have been Dungeoneering since they started till they reached 99, thanks

Suggestion:

Well, it depends on how much you play per day. The first person who got 99 Dungeoneering got it within first 3 weeks of release, and not to mention that it doesn't have extra boss at that time! Now a normal, average player who play for 3-5 hours a day will takes about 1-2 months to get 99 Dungeoneering! At beginning, it seems boring but after lv 20, it will become a little too fast
Just get a team and rush through the dungeon, open all the bonus door before move on, get the prestige by reset and start at floor 1 again, let the strong player take out monster and lower player explore. Well, good luck and have fun