In the US there is no requirement, as of 2011, for any particular frequency of revision of MSDS. They must be revised when the information changes. Canada expects MSDS to be revised not less often than every three years. Other countries have other requirements.
Chemical manufacturers must update the safety data sheets (SDS) with new hazard information within three months of becoming aware of the new data. This ensures that workers have access to the most current information on chemical hazards.
The United States does not have a specific time within which you must incorporate new information into an MSDS. You are required to include relevant new information as it becomes available and to provide a copy of the updated MSDS to your customers with their next order. The requirements in other countries will differ.
MSDSs expire every 3 years. The MSDS must be updated by providers as "International Chemical Safety Data Solution" any new information that has now become available. If there is none, the date of the review must be identified on the MSDS and the MSDS is now valid for a further three years.
To ensure accurate information, listings for television programming must be updated regularly. It is often updated nightly, but it can be updated more frequently should the information be available in time.
most dictionaries are updated yearly and some are only updated every decade
It gets updated really often, almost daily
With the increasing demand on gold, quotes need to be updated quite often. In todays time, gold quotes are updated approximately 3 to 5 times a year, when before they were only updated yearly.
Constantly !
Anytime!
Every year the codes are updated and published.
Material Safety Data Sheets (MSDS) do not expire, but they should be updated regularly to ensure that they contain the most up-to-date information about a chemical substance's hazards and handling procedures. It is best practice to review and update MSDS at least every three years or whenever there are significant changes to the chemical's properties or regulations.