It doesn’t count pause times to the TSS calculation. So in your example, if you would be driven home, it would end up in a similar TSS.
If you go downhill you don’t need another 10m, maybe 1m. so your TSS won’t be so high as in your first post.
Just try it. So, in reality that is not a real problem, more a problem ‚on paper‘.
The formula is not perfect, but there is no better. What would be your better Load calculation?
TSS = (sec x NP® x IF®)/(FTP x 3600) x 100
…where
“sec” is duration of the workout in seconds,
“NP” is Normalized Power® (don’t worry about this for now),
“IF” is Intensity Factor® (a percentage of your FTP; in other words how intense the effort was),
“FTP” is Functional Threshold Power (your best average power for a one-hour race or test),