How many watches do we really need to own?

TheStyleBlogger argues that we only need one watch.  I like this mind set.  It's easy to get caught in the trap of thinking we need an entire collection of watches.  With mobile phones, arguably we don't need a any watches.  Watches have become a piece of jewlery.  How many pieces of jewlery do we need to own?  I would argue back to Dan Trepanier that we also need an outdoors watch akin to a Casio G-Shock.  The answer is: two watches.
MSB