when i create PFX file in acrobat reader, it shows validity for 5 years. Whether it is possible to set to infinity or for a long period. whether this 5 year restriction is only for PFX created through Acrobat or it is a global standard?. Please guide in t

when i create PFX file in acrobat reader, it shows validity for 5 years. Whether it is possible to set to infinity or for a long period. whether this 5 year restriction is only for PFX created through Acrobat or it is a global standard?. Please guide in this regards, thanks.