Cause I do. At around the 3:30 minute mark I start to feel the burn and fatigue. Sometimes I can push it all the way to the end, but if I do I'll have to rest for like 5 minutes! I've been playing for almost 5 years and can work my way through the 30 minute madness of Cassandra Geminni (The Mars Volta). Am I the only one? Or are there others who find trouble playing this song all the way through? Any endurance tips?