Idling for hours

Idle hours are wear and tear over time, but if it's just for two days you'll be fine. The biggest thing is you have all of the components working for that period of time. Police officers, security officers, and others in similar lines of work have thousands of hours of idle time on their vehicles due to the nature of the jobs they work. I honestly wouldn't worry about it if I were you.

It won't hurt a thing. During a recent power outage I idled my Dodge Ram about 30 hours without issue.

Change the oil afterwards. 20 hours of idling is equivalent to 1,000 miles or so.