Beans
Whole beans vs ground coffee for an office
Ground coffee is sold as a time saver. For an office or a warehouse tea room it is usually a flavour problem. The work of grinding is moved to the factory, and the clock starts when the bag is sealed.
Whole beans belong in a bean-to-cup machine, a coffee bean machine for the office that grinds per cup. A plunger and a bag of pre-ground is a different product.
How ground coffee fades
Once you grind, more of the coffee is exposed to air. Flavour leaves faster than it does from whole beans. A bag of pre-ground that has sat in a cupboard since winter is not "a bit stale". It is why a plunger in a kitchenette so often tastes like the cupboard. The method is fine. The grind is old.
We are not clocking that in minutes for your site. Buy small and often if you stay on pre-ground. Or stop pre-ground.
What whole beans ask of you
A hopper and a grinder. On a bean-to-cup machine those are the same object. You fill the hopper, you press a button, it grinds for that cup. Nobody on site learns to dial in a burr set.
If the floor is on a plunger with no grinder, whole beans mean buying a grinder or changing the machine. There is no third path that keeps beans whole and still pours a cup.
Storage is easier when the beans are whole
Keep them sealed, at room temperature, out of the fridge. Finish the old bag before opening the new one. Ground coffee can follow the same rules and still taste tired, because the damage is already done.
Volume still matters. How much a 20-person site drinks is the quantity question. Whole versus ground is the quality one.
The plunger leftover
Sites that "mostly" use a machine still keep a plunger "for when it is broken". That plunger then gets the open bag of pre-ground. The backup becomes the weekday method the first time the machine looks busy.
If you need a backup, keep a small sealed bag of whole beans and a way to grind them, or accept that the backup will taste like backup.
For a workplace, the machine decides
If you have a bean-to-cup machine, buy whole beans. If you do not, pre-ground will keep a plunger going. Buy small.
Arico installs a Saeco Royal Plus that grinds per cup, and delivers whole Arabica monthly, from as little as 40 cents a cup. That pairing is the point of the machine plan. Whole beans in a hopper you never grind would be theatre.