Our puppies - in - training can't be left home alone for long periods of time on a regular basis. (guidedogsofamerica.org)
But excessive amounts, sitting for long periods of time without a purpose, can cost you big time. (moneysense.ca)
The design is a dead simple rectangle with rough angles, but it's thin, light, and easy to hold for long periods of time without getting tired. (businessinsider.com)