just a bit more info as I looked it up too as my return on a trip that i'm hoping goes ahead will have a 5 hours wait in SIN
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Rest and relax at your designated transit holding area
Facilities in the
transit holding area include comfortable seating, complimentary WiFi and restrooms. All transit passengers will be able to order food from outlets in Changi Airport, which will be delivered to them. Food kiosks and vending machines are also available in Zone B.
Do note that you must stay within this designated transit holding area at all times, and remember to keep your face mask on unless you are eating, drinking, or smoking. For duty-free shopping, be sure to pre-order from
KrisShop.com at least an hour before your Singapore Airlines flight departs from Singapore to have your purchases delivered to you in-flight.
If you are a PPS Club member, Suites, First Class, or Business Class passenger you can access the premium waiting area where complimentary WiFi, food and drinks are available.
Transit passengers may wish to note that Aerotel Singapore Transit Hotel, the transit hotel at Changi Airport Terminal 1, and Ambassador Transit Hotel at Changi Airport Terminal 3 are open for
bookings . Passengers with a hotel booking will first be ushered to the airport’s transit holding area for verification checks. They will be guided to the transit hotel only after the checks have been completed. They must remain in the hotel throughout their stay. Upon checking out from the hotel, they will be ushered to the transit holding area before their connecting flight.