I've seen a 6 inch diameter pitcher blown using 50mm heavy wall tube and a GTT Delta Mag. It was about 9 inches tall. I think there have probably been larger pieces made by someone but I haven't seen them in person.
The ability to do something like that is determined more by your experience than anything else. Can you effectively handle a large piece of heavy molten glass? If so then go for it. By the way a Delta Mag turned up will empty a K tank of oxy in about 15 minutes.
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