It's taking much longer because Runetrack is down :/
Use RuneTracker. It's more accurate and it isn't down.
Runetrack is to the exact xp, whereas Runetracker is to the nearest million gained. Unfortunately the only way I could use Runetracker is by looking up each skill for every person. For 15 people and 25 skills minus the 200M's that's well over 300. I will just wait another day to see if it comes back, and otherwise just go from rs hiscores.
I'll give you a few examples:
http://runetracker.o...ack-s u o m i
There you can see the XP rate from them in the last 7 days (or last 168hours).
Runetrack has been down for several days now.