The time required to don armor depends on its type; see Table: Donning Armor.
Don: This column tells how long it takes a character to put the armor on. (One minute is 10 rounds.) Readying (strapping on) a shield is only a move action.
Don Hastily: This column tells how long it takes to put the armor on in a hurry. The armor check penalty and armor bonus for hastily donned armor are each 1 point worse than normal.
Remove: This column tells how long it takes to get the armor off. Loosing a shield (removing it from the arm and dropping it) is only a move action.
Table: Donning Armor
Armor Type Don Don Hastily Remove
Shield (any) 1 move action n/a 1 move action
Padded, leather, hide, studded leather, or chain shirt 1 minute 5 rounds 1 minute1
Breastplate, scale mail, chainmail, banded mail, or splint mail 4 minutes1 1 minute 1 minute1
Half-plate or full plate 4 minutes2 4 minutes1 1d4+1 minutes1
1 If the character has some help, cut this time in half. A single character doing nothing else can help one or two adjacent characters. Two characters can't help each other don armor at the same time.
2 The wearer must have help to don this armor. Without help, it can be donned only hastily.