i recall back in the early 90's Excalibur airlines tried Banjul BJL there and back but did not last long
(2 sector day - with a 2nd crew used to prep and board pax on the a/c then the operating crew boarded at the last minute)
the CAA did not like it
Thomson also tried Dakar once as a new holiday destination (not) in 1990/91 as a there and back - didn't last long!
Thomson's night stop for BJL and cape Verde islands (CV at 2320nm is about 100nm less than BJL)
one of the longest 2 sector days I recall was LGW-Aswan 2250nm and GLA-Sharm was usually a night stop for crews but most other SSH flights were there and back for the crew
although BA night stopped when they op'd SSH from LGW and it was a Long haul 777