Basically, counts as 3 days.
I suppose with the card you mean a high level card at the specific rental place.
4h is a lot.
If you shlep when arriving and return a little early....
If you meant a 7 seater, I see for 3 days all all included at $170 (change residency to Belgium in search results).
2 days = $120 all incl
Also 2 days, SUV = $105 all incl
Premium = $119 all Incl