Raraku is so close to JOAT, he needs one last notch in building before he achieves Jack-status. Ive been hovering over him for hours now, putting him back on hut after hut after hut. It seems like hes hit a wall, and isn't gaining any experience. The game says he is, but Im just not seeing the improvement

http://img156.imageshack.us/my.php?image=joatph9.png

Can someone give me an idea of how long this will take, of if theres any faster way to get his last smidgen of builder exp?