Based on the research contained in the book Polearms of Paulus Hector Mair, translated by David James Knight and Brian Hunt.

Shortstaff / Short Spear

Roughly 6 foot long

Lance / Longstaff

Mair uses weapons that were about 10 feet in length, but lances up to 13 feet long were not uncommon.

Halberd

Six foot in length.

Poleax

From 4 to 6 feet long, this weapon has a butt spike and smaller axe head. Also note the perpendicular spikes coming out of each side of the axe.

Boar Spear

This is a 8 foot spear. There are only a handful of plates on it in Mair. These spears would have lugs on the sides of the blade or haft that prevent a weapon, or a boar, from sliding down the shaft.