>>27984805Kronii has approximately 22 Furnaces spread around Bunkeronii. (She has at least 6 Blast Furnaces but I don't think those can be used for Glass)
Each Furnace will have to produce approximately 818 glass blocks.
A Furnace cooks an item every 10 seconds.
Assuming Kronii was constantly maintaining the Furnaces and; it would only take a bit over two hours to craft the 18000 blocks.
Not accounting for the time needed to collect all the Sand and Lava.
