HeLL-SeeKeR: I think it would give us wrong stats If we count 3 login=1 minute .... And it would be totally fair to the old users to public their online time as We'd know who has been more active here
3 logins to 1 minute is a very conservative estimate, so we can be reasonably sure everyone has been online for at least the time indicated by the result. This is just a one-off boost as it looks better than everyone starting on zero. Differentials in online time would occur anyway as new users register. The stats are public as I mentioned, check Statistics > Memberlist > Mostonline and also the additional info of profiles.