You can be 18 days on tour in a month.
Favorite layovers? Difficult to say. The Germans like to be in South America, others like Asia. It's personal.
Commuting is possible but costs you a lot of time. Each month you have a 7 days off period,but between tours of a week there can be as little rest as 48 hours. And that is what makes commuting difficult. During sby you have to be in LUX too. So you'll need something where you can sleep.