So I used the effect command with this line,
"/effect @a[x=473,y=81,z=539,r=35] 23 240 20 false"
and it gives me the effect of saturation, but only for 11 seconds, not 240.
MC-52422
Saturation effect command incorrect seconds
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Saturation is an instant effect and has no duration resp. the remaining time is cancelled if your hunger bar is completely filled up.