I had a big Saturday in-game. I ran my first challenge mission and I joined some guildmates for my first visit to the Underworld. The guild leader was recently traumatized by my still being on the easy Hall of Monuments points, since the veteran players are mostly at the point where getting another HoM point requires maxing five titles. After we cleared the Underworld, he asked, “So, Zubon, did you get five points today?” He was gobsmacked when the answer was “Actually, yeah.” That challenge mission filled my Fellowship monument, and Underworld was my fifth title.
As I recall people saying of the Hall of Monuments, 15 is where it stops being easy, 30 is where it stops being sane, and 50 is where it just stops. Steam says it took 215 hours to reach 16 points, so there is your barometer if you want to know what is possible/convenient for getting HoM points for GW2. I started with absolutely nothing, and some of that time has been spent on longer-term goals like my pre-Searing character that is level 13.5 (halfway to Legendary Defender) or about a day AFK during the festival. A casual, 10 hour/week player can probably get to 15 points before GW2 launches, and a really hardcore player could do it before open beta.
Added: HoM guide. You’ll get most of the way there just running the campaigns and playing normally. Getting later points takes work and grinding, but I haven’t ground anything yet.