It can obviously be done in the database via a sql statement but there isn't currently a way to change via the web interface. However it's such basic tracking can't you just log the number now and take that away from a future total?
HTH
Ron
Without access to the database I think I'll have to stick with the manual method for the time being...
(And the lesson learned here is not to embed a live learning object into another in-progress object if you don't want every page refresh counted in the usage stats!)