How many clamps do I need?

The general rule is to space your clamps at 600mm centres but if the wall is 100 to 150 mm thick you can space the clamps at 900 mm centres.

For example; if you are building a 300mm thick wall and have 1.8 m, long boards, you will need 3 sets of clamps, one in the middle and one each 300mm from the ends of the boards
if you are building a 100mm thick wall and have 2.4 m, long boards, you will need 3 sets of clamps set at 800mm centres and 400mm from the ends of the boards

Allow two sets of clamps for corners and three sets of tees