[Feature Request] Specify delay before calculating ETA

[LiamillionSS]

My new Ender-3 V3 SE has a longer delay than my previous printers before starting prints (auto-levelling, heating etc) which blows the ETA way out of proportion, like a 2 hour print estimating over 24 hours before slowing coming down to a more accurate measurement over the next 30 or so minutes. This also means estimated time for 30 min prints is basically useless.

Improving this could be achieved by being able to specify a delay which the calculation ignores while the printer is setting up, for instance in seconds between 0-999.

Thank you for all your effort, this is an incredibly useful tool