Wikia

This official news post is copied verbatim from the RuneScape website. It is copyrighted by Jagex.
This update was added on 16 March 2012.

The Bonus XP Weekend has begun! If you’re a RuneScape member, your x2.7 XP modifier will come into effect the next time you log into the game. Your modifier will decrease every 30 minutes of in-game time, as shown in the table below. Once you have reached x1.1xp, it will stay that way until the Bonus XP Weekend finishes at midday (BST) on Monday.

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

The XP button left of the minimap will give you information on your current XP modifier, and how long until it next decreases, via a tooltip.

For a clearer idea of which actions will and will not be affected by the Bonus XP Weekend, and for more information in general, take a look here.

Enjoy!

Mod Fetzki
Head of RuneScape