Unless you have a specific issue/injury you’re addressing, I’d spend zero time doing this. If anything do it during your kettlebell work.
I’d spend 100% of that hour on the bike if your goal is to get fitter/faster. I’m 44 and on the HV plans and spend 0% of my time on “mobilization”. I use the warmup already built into the TR workout or at most add an additional 5mins of easy spinning.