How late before a server save can nemesis boss spawn?

Question

I've heard that maximum time is depending on how long boss can stay before puffing, is that true? For example:

* vampires stay for 8 hours before despawn, does it mean it can spawn maximum 8 hour before server save?

* poi bosses stay for 4 hours, does it mean it can not spawn if there is less then 4 hour left to server save?

Comments

You're asking how long boss stays after spawning, not the maximum time it can spawn.

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Howcio can you clarify did you mean how long they stay after spawning?

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It's difficult to confirm, but I believe so. My boss group, for example, never found any of the vampires after 2:00 CET.

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@shawtay I have no idea for what you changed the title if content says clearly what im asking for. I ask on what time it can spawn maximum, not how long bosses stay after spawn.

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My apologies your wording confused me and I thought raven was was your response. No worries.