Can someone please explain this?

[chucklestheclown]

Originally Posted by my miss storm cat

Maybe I should just accept that this is something I'll never undestand (?).

It's too abstract.

I read the first paragraph and I'm wondering well how are they coming up with expected normal time anyway.

Young lady...you are not supposed to understand it because it may not even exist. You are fine doing what you are doing. Trust Me.

But this is plain english:
Certain complications in the calculations of daily track variants are well-known and have been widely reported. On days when the track surface has been fast early and slow later, or vice versa, figure handicappers split the variant. Sprints might be Fast 3 for races one to five, but Slow 3 for races six to nine. Splitting the variants to reflect track conditions at different points in the racing day can be important and greatly advantageous.