Two to five minutes before the most exciting decisive move happens.
Two problems:
1. Sometimes, the decisive move means that everything from that point onward gets rather un-exciting.
How exciting was SB really after the decisive move?
In that case, it's all the stuff leading
up to the decisive move that's actually more exciting.
2. Sometimes, it's really hard - even in hindsight - to know what the decisive move was.
What was the decisive move in GW?
Was it VDP forcing that selection?
Could you even argue that it was Milan's attack? Tiring VDP out, paving the way for Pedersen's win?
Of course, both those races are races you'd probably benefit from watching in their entirety, then go invade the TV producers' office to complain about the fact that they didn't provide full-race covering.