Well, I ventured back to Cycling Center Dallas for the first time in quite a while, taking advantage of a "come back for two free classes" offer...  since I'm anticipating doing Paluxy and The Wall in a couple weeks, I figured a little extra hard riding wouldn't hurt -- and I used the Rocket with the Hoagie seat, instead of the Xstream, because that's what I'll take to Paluxy
 
This was a "3 Minute Power Test" session, lasting an hour...  after a ~10 minute warmup, you upshift and give it everything you've got for three minutes, then recover for 5 minutes at an increasing ~50-70% of your "FTP" (Functional Threshold Power)... then repeat... and repeat... and repeat....and repeat.... and repeat a 6th time.
 

 
My "FTP" was set to 205W, as a reference.  
 
Not having done this sort of thing before, of course I "went out too fast" on the first 3 minute sprint, topping 500 watts and holding it for a minute before realizing that three minutes is a LONG TIME...     So, the rest of the sprint sessions, I typically held at 300-320 watts the entire 3 minutes, with a power burst the last 15 seconds.
 
Average overall power for the hour long session was 220 watts
 
Max wattage thresholds were
Max - 518
5 sec  -- 480
10 sec -- 478
20 sec -- 462
30 sec -- 461
60 sec -- 353
2 min -- 334
 
Doing the three minute sprint / maxout, I could kinda tell that I'm more used to doing TWO minute sprints...  that last minute was hard to hold....
 
I'm planning to do it again next Monday.