"I've no idea how long a typical Suez transit is."
For yachts it is (supposed to be) two days. It's one day to Ismailia on either way and then one for the rest. (The paperwork however, may take longer, but can be arranged in advance.) See more at https://www.noonsite.com/report/suez-canal-transit-informati...
walrus01 linked a video here yesterday [0] of a ship transit. For a ship it takes 11 to 16 hours, including stop on Great Bitter Lake in the middle of the canal.
6000Nm and, say, 25 knots (probably a bit on the high side, but not by much) should add 240 hours of steaming or 10 days to the voyage.
(This will be somewhat offset by the lower speed through the channel, waiting times &c - I've no idea how long a typical Suez transit is.)