Look about right, like you didn't leave anything in the tank. Nice even effort and 4 seconds is a big jump. I've been thinking that 500 might be the next one I try to improve, try to leapfrog some guys.
Ha ha! But first you have to get back home! Good luck today!
I sure didn't feel like I had anything left at the end. But with only 550m I was in the final 100m before I knew it...and time to go anaerobic and give it everything I had.