Please also keep in mind that the flight is still ~9 months away, so chances are not too low that there will be time changes in the schedule, which might lead to more/less time in FRA. So right now I wouldn't worry too much. Check back around September and things should be clearer then. If times stay like this and you miss your flight, you are either rebooked through MUC (arrival 7pm instead of around 1pm) or are put on a different carrier.