As far as I know it players can't get more than 1.000 ST units. If the yearly minimum is set below the days in a season they'll get the 1.000 when they reach that threshold. If it's more than that it seems they have to be on the roster the whole season.
So I suppose you need the number of days in the season including off days. Or probably any high number if it doesn't crash the game.
The minimum is just there for the IRL convention to allocate 1.000 ST to players who are slightly below a full season.
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