Subject: Boiling down maple sap faster?

I have recently harvested a good amount of maple sap and am in the 
process of boiling it down.  All the resources that I have looked into 
have told me that it should take about 3-4 hours untill complete 
reduction.  Despite the constant boiling, it has been taking me much 
longer to reduce than I would like(5-6 hours) and was wondering if 
there was anything that could be done to speed up the process.  Is 
there anything that I could add to the boil that would not effect the 
flavor?  My elevation is only a hundred feet or so above sea-level.  
PLEASE HELP ME!  My mother is getting rather upset at my constant use 
of the stove and I fear for my freedom.  (I guess some people just 
don't realize the true virtue of real maple syrup.)

Re: Boiling down maple sap faster?