What is the rate at which the bonus multiplier goes down?

Every 30 mins if it goes by the previous weekends.

Thank you but i guess i should have been more specific. I want to know how much of the multiplier i lose every 30 minutes.

Check the announcement archives for last march's bxpw bonus rates.

Game time (mins) XP Multiplier

Up to 30 x 2.7

30-60 x 2.55

60-90 x 2.4

90-120 x 2.25

120-150 x 2.1

150-180 x 2.0

180-210 x 1.9

210-240 x 1.8

240-270 x 1.7

270-300 x 1.6

300-330 x 1.5

330-360 x 1.45

360-390 x 1.4

390-420 x 1.35

420-450 x 1.3

450-480 x 1.25

480-510 x 1.2

510-540 x 1.175

540-570 x 1.15

570-600 x 1.125

600+ x 1.1

 

Edit: from last bxpw

Thank you very much.