Do bricks that came from daily check in disappear or expire after a certain time?

#1

do bricks that came from daily check in disappear or expire after a certain time

#2

Supposedly bonus bricks disappear after 30 days.

#3

Man I was going crazy wondering why am I bleeding bricks everyday this week. This explains it.
I wonder when this rule started though.

#4

Since they started selling bricks.