It took me two-and-a-half years of fairly consistent participation to get to 10K, actually less, because I don’t remember when the Lurve started. However, because no one had maxed-out on anyone (and I don’t think the limits were in place right at the start), a lot of people hit 10K much faster than I. It then took me four years to get to 20K, meanwhile, people who started long after me have 30 or 40K.
I honestly stopped caring about the Lurve score ages ago – even before 30K. I’m fairly choosey about which threads I participate in, so I’m not going to get the kind of Lurve that other folks who post a snappy retort on virtually ever post will. If you really want to increase your score, start participating in threads that might be outside of your ‘comfort zone’, because you’re more likely to run into folks who have not yet maxed out on Lurving you. If you’re using the Desktop version, you might want to use the “Active” and “Orphan” buttons to jump into posts where others are actively participating, or to see of there’s any unanswered Question that you might be able to answer.