Plants vs. Zombies turns 7. The Birthdayz Pack is in the sticker shop.
The ten-hour clock only ticks when the game is open, so if you want to conserve your time, make sure you close the game when you're finished playing. If you continue the battle once your 10 hours are over, all of the progress you make carries over, including Player Loyalty Rewards.
The free 10-hour trial ends May 10th.
http://www.pvzgw2.com/news/pvzgw2-free-trial