Glow light is on longer when it's cold on both vehicles but the timing of the relay seems independent of the length the light stays on. It's always at 75 and 28 seconds respectively.
It's hard for me to conduct a comparative experiment on the length of glow because the 85 starts better in cold weather than the 79 SD. Don't know the reason for this. My impression at the moment is that the 116 starts easier with the full 75 seconds rather than starting when the glow light goes off.
I think the 116 relay senses the temperature in the head and the 85 sense it at the relay itself.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13