Choosing length of lease

["John M. Wobus" <[e-mail]>]

Thanks to all who have answered questions I've posed here for the
purposes of getting material for the DHCP FAQ & thanks to everyone on
the list for humoring my queries.

Another question I'd like to pose and answer in the DHCP FAQ is "How
long should a lease be?" In the interest in offering something more
helpful than "it depends on your site/goals/etc",  I pose these
questions:

(1) At your own site, how long do you make leases and why did you choose
    this time?

(2) Are there lease-lengths that you would consider to be a lower-bound
    or upper-bound for any ALL practical uses?  If so, what would you
    be trying to avoid by staying above/below this bound.

Naturally, if there is a lease length you consider to be ideal (or
adequate) either for all applications, or for some specific
application, I'd be glad to hear about it.

I will read the material and compose an answer for the FAQ based upon
what people send me or post to this list.  My goal is to include a few
numbers as guidelines or ranges; what I wish to avoid is merely saying
"make it shorter if...make it longer if..." without giving any number
to base that upon.  Thanks in advance to all contributors.

John Wobus
[e-mail]