Men's retreats are one of the only things that allow men to take some time away from the often harsh requirements they must deal with to take care of themselves. At the present moment, even though you may see a lot of men taking care of their extremities by exercising, grooming, etc, the inner self is often terribly neglected.
During a retreat, there will be a host of organized activities that will span enjoyment and pure fun. As far as the timeline goes, while some retreats will go on for an extended period, many of them will only go on for about a single weekend or so.
Daily life can be incredibly daunting and, unfortunately, the damage that it can cause mentally is often looked past, especially where men are concerned.
Most men tend to have free time on Saturday nights, and this is when you will typically find that a retreat starts.