This topic was discussed a number of times.
There is a person on this forum, who just completed a 48-day Master-Cleanse
and feeling AWESOME.
I did a 21-dayer myself and couldn't be happier. My freand did it for 31 days and lost her life-threatening chronic desease. I've been doing this for many years now and my health improved dramatically.
Don't tell your co-workers. They are not bad people, just totally unfamiliar with this wonderful technique. Just go ahead and do it.
Good luck and keep us posted.