How long do they actually last?  The web-site said the Matts last approxiamtately 4 hours, but what about the butane?  And is this accurate.  
Could you set up a couple of these on the ends of the awning of an RV and keep the mosquitos away from the sitting area underneath said area and keep all the mosquitos out?  I guess what I am asking is the 15 x 15 area an accurate statement?  And is it cumulative when using multiples that are spread out.?