You never know what someone is going through. Be kind always.
A burnout refers to any activity or factor that is performed so often that the task becomes tedious and unrewarding. If you work 12 hours a day 7 days a week then burnout is not only possible but it will happen eventually. Life needs to be balanced, and if you spend all of your energy on one component then you will experience burnout at some point. The time it takes for burnout to set in can vary, depending on the individual and task or activity involved.