Question (stupid?) Should system be at saturation pressure?

[RANGER1]

Question is to open when you say ANY system, as say if a freezer suction pressure could be freezer saturated temperature , if insulated vessel with level of chilled refrigerant from when it was running the day before, the list could go on.
Is there a reason you ask?
Turn it off for longer, say more than a week for large system, all rooms& doors open.
Sun, shade, day, night, freezer floor could have minor influences.
A lag time could also happen for things to warm up, cool down.