According to Straits Times 2,379 cabin crew left SIA between March 2020 and 2021. Now with more VTL opening up, SIA requires more crew. ST does not know how many crew does SIA requires. However, my guess is between 700 and 800 crew. The question now is how many would want to join SIA? Not many I guess as the conditions are not as favorable as prior to Covid days.
To begin with, I don't think the crew will have "long" nightstops overseas. They may slipped into a station after a long grueling flight and allowed the minimum hours of stay as required by law. Another reason may be due to the restriction of movement during their nightstops. They may not be allowed to leave the hotel rooms due to the on going pandemic. I think it will be good if the airline can clarify the above 2 points.
The above is my personal opinion and I may be wrong (I hope I am wrong).