A day is the length of time the Earth takes to rotate once. A year is the time the Earth takes to orbit the sun once. There are about 365.25 days in a year.
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-- They only get longer between December 21 and June 21. For the other half of the year, they get shorter. -- Just after December 21 and just before June 21, they get longer very slowly ... only a small difference between one day and the next. -- Around March 21, they get longer fast ... many minutes' difference between one day and the next. EDIT: The length of the day differs by 4 minutes each day throughout the year.
each is a singular
The difference between "at least" and "at most" is not restricted to probability. The difference is simply one between the precise meaning of the phrases in every day English language.
The treatment effect is the difference between the observed outcome and the "normal" outcome
Volume is the number of issues in a year.