The Egyptians could produce glass, but only in small quantities (usually as rods or beads) that were then melted and moulded into a new shape. As a result of this process, large glass objects were exceptionally difficult to produce, and clear glass could rarely be cast larger than a rod or bead. Vessels were produced by wrapping or dripping molten glass onto casts - it wasn't until the first century BC that blown glass started being imported or produced in Egypt.

The piece of experimental archaeology I saw would have produced (if 1 of the shelves had not colapsed) 4 large cakes of bright blue glass - from memory 30cm dia by 10 cm high - the same size as the ones from the Turkish (uluburun?) shipwreck.
They probably could have done 1 run every 2 days and there were 2 suitable furnaces at the sight.

Just thought - a lot of illustrations of middle eastern glass making (including ones in works that say Egyptians could not make glass) copy Petries incorrect EGYPTIAN illustration of glassmaking. He thought the crucibles were stands and they made it in 2 stages - 1st frit which they then melted to cakes.