Thank you all for responding to my request to test mail delivery times to Hong Kong when the virus first started affecting Hong Kong badly and flights were being cancelled left and right and post offices worldwide said they could no longer guarantee delivery times to Hong Kong. I have some inital test results now based on those who responded to my request and/or other recent mail from RAoC where I was able to read the postmarked date.

In general, mail being sent from Hong Kong does not appear to be too affected to places worldwide when I sent them in Feb. Asia and UK based RAoC-ers reported that they got my mail within 4 days and up to a week. US based RAoC-ers reported that they received my mail within 1-2 weeks.

And finally, for results of sending mail to Hong Kong. I have broken them down by country and for more accuracy!

ASIA
Japan: 27 days based on 1 envelope
Contributor: u/shadesoflanternhill posted her envelope 14 Feb and didn't reach me until almost a month later. It usually takes up to a week from Japan to HK before the virus hit.
Conclusion: MAIL AFFECTED

Malaysia: 18 days based on 1 postcard
Contributor: u/StephanieTay Seems unaffected based on previous mail that I've received from her and taken the same amount of time to reach me
Conclusion: MAIL UNAFFECTED

Philippines: 15 days based on 1 postcard
Contributor: u/mangocheesecakegurl Seems unaffected based on previous mail that I've received from her and taken the same amount of time to reach me
Conclusion: MAIL UNAFFECTED

Singapore: 6 to 11 days based on 6 pieces of mail (Averaging 8.1 days)
Contributors: u/misstpwen u/LeeElla u/halfwayoutoftown and u/m0nk3ykLng
Conclusion: MAIL UNAFFECTED

OCEANIA
Australia: 7 - 10 days based on 2 postcards
Contributors: u/amrache u/talkingroses
Conclusion: MAIL UNAFFECTED

New Zealand: 14 days based on 1 postcard
Contributor: u/tashsmash
Conclusion: MAIL UNAFFECTED

​

EUROPE
UK: 7 - 14 days based on 6 pieces of mail (Averaging 10.7 days)
Contributors: u/crackingtoast u/hallucineating u/jaydeepea u/MegTheMonkey
This was an interesting experiment because u/hallucineating offered to send me 3 different pieces of mail (postcard, card in envelope, package in bubble wrap with 10 masks with "Surgical masks" written on the envelope itself and was all posted at the same day. Her prediction was postcard, package with masks and then the card in an envelope. Actual results: card in envelope (9 days), postcard (11 days) and package with masks (14 days). At one point, we were both convinced that someone had stolen the package with masks written on it because Hong Kong was so desperate for surgical masks then.
Conclusion: MAIL UNAFFECTED

Germany: 7 days based on 1 postcard
Contributor: u/suzilla10
Conclusion: MAIL UNAFFECTED

NORTH AMERICA
Canada: 25 days based on 1 envelope
Contributor: u/2dogsintheyard
Considering that I usually receive mail from Canada within two weeks before this, delivery times seems affected because Air Canada cancelled their flights to HK beginning Feb.
Conclusion: MAIL AFFECTED

USA: 11 - 43 days based on 15 pieces of mail (Averaging 22.9 days)
Contributors: u/isbirdreallytheworld u/ninajyang u/mareepharos u/cecemarie u/nettesodark u/poisonouskey u/reclusiverabbit u/google_panda u/kelstars u/kimmylubs u/thriftyriver u/ckralo2 u/skylineprophets u/sassyliltart

This was the most interesting, mail posted between mid-Jan to early-Feb was the most affected taking over 30 days to reach HK. Early-Feb to Mid-Feb took around 25 days to reach. Mid-Feb to End of Feb took around 12 days to reach. It appears that USPS is backlogged with mail to Hong Kong and that more recently sent mail towards the end of Feb/early Mar is reaching me first.
Conclusion: MAIL PARTLY AFFECTED

Honorable mentions:
u/MeowPrincessSandwich for offering to send me some test mail from the US before my actual request on RAoC but her card still hasn't reached me yet.
u/Ignaposts where the Chilean post office refused to accept her mail to Hong Kong.

Thank you for all contributing to helping me identify the latest mailing times to Hong Kong! Now I'm off to make an official thank you post on RAoC! I will continue to mark down when I receive mail and continue to share my findings on RAoC_meta!