I bet he won't run 1:45 again indoors, and probably even outdoors. Who does 600m time trials in November?
My college coach made us (our middle distance group) do a 600m time trial in November during my Freshman year. She also had us do a 1500m, 10 minute, and 4 mile time trial all in a 7 day span. The first one was on a Wednesday, then another on Friday, then the third one the following Monday, then the final one that Wednesday. She let us as a group choose the order we would do them and we chose 600m on wed, 4mile on friday, 1500 on Monday, and 10 minute on Wednesday. We had a workout after each of these time trials as well.
I thought it was weird at the time. Now that I am a coach, I wouldn't do this with my athletes. I would do a 600m time trial and have them run a 5k road race instead. Combined with training splits, those two data points should give you 90% of the information you want with less distraction from training than doing 4 time trials in two weeks.
In the case of what my college did, we ended up with times all over the map because of it being time trials as well as being too close together. I ran 1:23 for the 600, 21:18 for the 4 mile on Friday (perfectly flat, but accurately measured), 4:10 for the 1500 (coming through 1200 in 3:12, man did I die hard), and only 3100 meters for the 10 minute.