I hear that on working on the GS. I had two myself. My Suzuki Bandit 1250S just took me about 2 hours to change out the air filter, spark plugs , oil and filter. I use to do this, plus checking the valves, in about 45 minutes on the GS taking a coffee break.
A '00 KLR 650 40,000 miles, A '07 1250S 74,000 , A '03 5.3L Chevy Truck 78,000 + '43 style dude , Simper Fi ;-)