Around here an 800 lb. round is pretty small and usually only contains about 17 to 19 square ones if that..so l'm not sure one round that size would last to long unless your also feeding a complete feed and limiting the hay..
I'm not really either, but I can monitior more and I don't have to feed alfalfa as much as costal...Still would question that it will really last that long. I feed 3 big horses (who have acess to the round bale, but one doesnt really eat any hay as he cant chew it). A round last them about 3 weeks. Just saying I wouldnt bank on it lasting that long if you free feed.
I to are feeling your pain i used to have big horses but i had to sell them as it was costing to much plus nobody was rideing them so it was easer to sell ..but still very hard and broke my heart ....now i have only 4 minis and only costing about $25 a week to feed...have you thought of leasing some horse out for awhile till you get back on your feet..
hope you work it all out