How to stipulate the validity period and deadline of bidding?

According to the bidding law of People's Republic of China (PRC):

Twenty-fourth the tenderer shall determine the reasonable time required for bidders to prepare their bid documents; However, the project that must be subject to tender according to law shall not be less than 20 days from the date when the tender documents are issued to the deadline when the bidders submit their tender documents.

Article 34 The bid opening shall be conducted in public at the same time as the deadline for submission of bid documents determined in the tender documents; The place of bid opening shall be the place predetermined in the tender documents.

Extended data:

According to the Regulations for the Implementation of the Bidding Law of People's Republic of China (PRC):

Article 35 If a bidder withdraws the submitted bidding documents, it shall notify the tenderer in writing before the deadline for bidding. If the tenderer receives the bid bond, it shall return it within 5 days from the date of receiving the written withdrawal notice from the bidder.

If the bidder cancels the bidding documents after the deadline, the tenderer may not return the bid bond.

Article 36 A tenderer shall reject the bid documents submitted by applicants who have not passed the prequalification, as well as the bid documents that have been delivered late or not sealed according to the requirements of the tender documents.

The tenderer shall truthfully record the delivery time and sealing conditions of the bidding documents and file them for future reference.

Article 37 A tenderer shall specify whether or not to accept a consortium bid in the prequalification announcement, tender announcement or invitation to bid.

Where a tenderer accepts the bid of a consortium and conducts prequalification, it shall form a consortium before submitting the application documents for prequalification. If the consortium adds, reduces or replaces members after the prequalification, its bid will be invalid.

If the parties to a consortium bid separately in their own names or participate in the bidding of other consortia in the same bidding project, the relevant bidding is invalid.

Baidu Encyclopedia-People's Republic of China (PRC) Bidding Law