I wonder when it'll slow down?

It's been a little over a month and the carboy is still burping away every 8 seconds or so, with no signs of slowing down. I'm wondering when I should rack it for secondary fermentation, as from what I remember reading, you do that when it burps every 30 seconds or so...

I haven't noticed a great deal of sediment on the bottom either so I guess I'll just continue being patient.