Putty

How long does it take for putty to dry?
Its been 2 weeks since we filled in the gaps around the garage windows with putty...and it is still soft to touch.
Tel has put most of the batons up and the feather edge boards were delivered yesterday...along with a big bag of nails. We are ready to go with the cladding.....it is going to look really good.
We are planning to hire a skip (as a treat at Easter) and clear out the mess next to the garage. We may need help from our neighbours to move the big stuff.