Due to work travel, I'm typically only able to train Thurs-Sun. Therefore I am overloading in those 4 days. For example, on Thurs-Fri, I will do a high intensity workout twice during the day (1 hr our less) and on the weekends I will do long bike/long swim one day and long run/medium bike the other day. So I get Mon-Wed as rest/recovery. Is this a sustainable way to train? I typically do 4-5 events/year, including an Ironman late summer/early fall. Thanks for feedback.