21:00 Steady State 
6:00 @ 2K+20
5:00 @ 2K+18
4:00 @ 2K+16
3:00 @ 2K+14
2:00 @ 2K+12
1:00 @ 2K+10

You're pulling one long piece with a gradual step up in both pace and rate. It starts pretty mellow but finishes nice and spicy. Used 1:56.5/500 as my starting point. This was actually done Tuesday afternoon but I forgot to log.