I am at 220 Days Played and I have only gotten one character to L9 in Undaunted, most are at L3 to L6. I do group dungeons maybe 3 to 5 times a week, and that is mostly a random daily. I run trials maybe twice a month, and rarely if ever PvP.
So, 200 days* plus of Solo.
*times 24 hours = 4800 hours
That's a bad example you're just a lil bit lost you can get from 0 to 9 Undaunted in 3h farming vet dungeons one after another not really a hood example of longevity.