Pickup winding wire has resistance per foot. each sized wire has more or less resistance per foot.
After a pickup is wound resistance is about the only thing left to tell how much wire is on a pickup.
When you make a pickup, you usually wind the pickups with a predetermined amount of turns.
A typical humbucker bobbin is wound with 4500-5500 turns of 42 gauge wire. The more turns the more ohms DCR.
A typical Strat coil will be 7000+ turns of wire.
The stagger was a Fender thing, because of non adjustable poles.
the poles were staggered to make the volume come out right.
This was more critical when 7 inch radius necks were used.
With a flatter finger board Non staggered pickups work just fine.
The Stagger is more of a vintage thing.
Good Luck, with your searching and reading!