Bit long ago to remember exactly (and i don't have log books on hand) but it was under ten hours.
I wasn't a particularly experienced glider pilot at the time I started my powered training, and I only ever accumulated 300 hrs in sailplanes.
I shouldn't imagine that gliding would appeal to everyone, none the less the skills gained are very worth while.
Sounds like you've never been in a 18' skiff with a good breeze if you reckon sailing's boring.
M