Not many :). As you may know, using a leather sole in wet conditions
can be hazardous - speaking as someone who has ended up flat on
their face during a number of occasions during a downpour. Not only
does a new leather sole not provide much grip, wet conditions are
not healthy for the longevity of a new leather sole. A 'bedding'
in of a new leather sole in dry conditions is advisable: it helps
the sole pick up dirt and grit, and form a crude but effective protective
layer against harsher weather conditions.