23.9x as of 12/17/18. Certainly at the low end of the range.
Update: $TPL scraped off of $500 mid day today (12/18). $500 implies a PE of 22.9x. So down a turn day over day.
LTM earnings this time next year are likely somewhere between $25 and $30. $25 x 22.9x = $572.5 or up 15% from here.
For reference, 20x current LTM earnings = $436. Looks to be a reasonable floor which is funny as it just about half the peak price we saw earlier this year. Two for one!