Really lazy timers for use in class

I frequently stumble upon "OK Google" type search queries that prove very useful in class. A good example of this is the timer function built into Google accessed through queries such as

"5 minute timer"

Easy enough. Easier still - webpage results can be bookmarked to a folder on the toolbar for quick access (or from this page, see below).

Lazy timers...

Follow one of the links below from a web browser.

10 seconds
30 seconds
1 minute
2 minutes
3 minutes
5 minutes
10 minutes
20 minutes