Interesting website to set deadlines while working:
If doing work online or near an online computer, http://e.ggtimer.com/ is a
convenient countdown timer. Just type the desired time limit directly into the URL
field and hit enter. The http:// can often be omitted. For example:
http://e.ggtimer.com/5minutes (or just “e.ggtimer.com/5min”insomebrowsers)
http://e.ggtimer.com/30 (if you just put in a number, it assumes seconds)