Can I extend the default certificate expiration date?

We are using Lotus Notes 5.0.5 almost two years and now most users are receiving messages that the certificate is going to expire. I am going to recertify the certificates. To specify the expiration date, Domino R5 automatically shows the renewal date two years out. Is there any significant reason why the default is like that? If I put the expiration date 10 years out, is there any implication? I need your expert advice.
Two years is just what was created as the default expiration. It is a reasonable time for most institutions. It is a good practice for security's sake to renew certificates every few years. That being said, I know many companies that change that date to five, 10 or more years. The only implication is a possible security concern if you do not properly terminate users.

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