How long does it take to send a letter from China to France? Which is better, EMS or other companies?

I use China Post. Generally, air transport (air transport, air transport, land transport and water transport, air transport is the fastest, followed by air transport, land transport and water transport, and land transport is the slowest) takes less than half a month to deliver. Any province, city, autonomous region or municipality directly under the Central Government sends an ordinary airmail (that is, unregistered) to France within 20g, and the postage is 6 yuan RMB (China Post applies 20g to ordinary airmail). Tariffs of European countries, the United States, Canada and other countries >). Delivery method: go to the mailing hall of the local post office (some places are comprehensive business), 1. Weigh the envelopes and letters. 2. Buy stamps and ask the clerk to stamp the envelope with an air stamp (the word air stamp means that the total amount of stamps posted on the envelope meets the air fare required by the destination, otherwise it may be treated as surface transportation, delaying the other party's receipt). Finally, write the letter: "Out of town"