Question : How many days should you spend in Munich if you're flying in from Tucson?
Answer : Of course you're not most people, but if you were, you'd stay roughly 12 days.
Question : Would you be willing to change your travel days if it saved you money?
Answer : The lowest-cost day to fly in December is Tuesday. Flexibility is paramount when booking travel plans in order to keep costs down.
Question : Are prices changing frequently for this route?
Answer : Flight prices for TUS to MUC change a lot more than the majority of routes. The further out you book a route, the more likely you are to save.