I've so far gotten 5 legendaries on my main with 38 days played. Got The Deceiver's Blood Pact the day 7.1 launched and Eye of the Twisting Nether relatively soon after which were at the time, at least as far as I'm aware, BiS legendaries for Elemental. Needless to say I was overjoyed.
Since then I've gotten Roots of Shaladrassil and shortly after 7.1.5 hit I managed to snag a Pristine Proto-Scale Girdle which ironically replaced The Deceiver's Blood Pact as an Elemental BiS in 7.1.5 due to class and legendary changes.
And just yesterday I got Uncertain Reminder, so now I've got the best 3 Elemental dps legendaries as well as 2 solid Enhancement legendaries should I choose to swap
Also started leveling my DK this week to ensure I got the hidden artifact appearance while Soultakers were up. As I was leveling in Stormheim, I got Draugr, Girdle of the Everlasting King from a single-use treasure chest.
Overall I'd say I've been very lucky with legendaries, especially since I barely do any legendary-enabling content besides the daily emissary.