I personally wouldn't want to do a month away from my kids, not at the moment anyway, but I can certainly see why others would. We've done full days, nights out and 1 overnight stay. Hopefully it will build up to weekends.
We went out last night without kids. It was great! Shame my in-laws are moving away in three months. For 11 years they (MIL mostly) made life hell but they have been mostly lovely for the last six months.