6'5" and riding a 61. The number of the frame size usually means the seattube, which of course nowdays is pretty useless. My maximum top tube length for a 120mm stem is 600mm with a 72.5 seat angle so not that long.
Currently my bike's top tube is 587mm with a 130mm stem and I have still room to drop the stem and make it longer. Proportions are so individual that looking for numbers is senseless