Just as I've got the 1949 BOAC timetable out as well (only 3 years before the original question), here is a detail from the last summer of flying boat operations to the Far East. Service to Singapore had stopped by then, but you could still go right round to Japan. No real night flying. 8 days for the trip ! Believe crews stayed with the aircraft for several days, and were slipped at Karachi and Hong Kong.
BO 900
Plymouth flying boat
Southampton 1100 Sa
Augusta (Sicily) 1900 Sa
Augusta (Sicily) 0900 Su
Alexandria 1515 Su
Alexandria 0700 Mo
Bahrain 1700/1800 Mo
Karachi 0145 Tu
Karachi 0800 Tu
Calcutta 1600 Tu
Calcutta 0600 We
Rangoon 1100/1200 We
Bangkok 1500 We
Bangkok 0800 Th
Hong Kong 1645 Th
Hong Kong 1000 Fr
Shanghai 1500 Fr
Shanghai 0800 Sa
Yokohama (Tokyo) 1630 Sa