neodymium magnets have a very high coercivity magnetic, the magnetizm don't change or demagnetizm if they are put in the natural environment or general magnet field.
If in the suitable environment,even after a very long time.the magnetizm won't loss too much.
     As a result, we don't consider about effect of the time. Shenzhen City Ri shengchang Magnet Technology Co,. Ltd. can produce strong magnets, the demagnetizm rate is hundred thousands.So in the normal situation, we can promise the long using period. If you need any help, please feel free to contact us or you can brower our website: www.rscmagnet.com to find you expected magnets.

                                        

                   neodymium magnets                                                  supermagnete                                                           shaped magnet