[cpsempek]

This depends on the lifter's weight (which is why there are weight classes in power and oly lifting competitions).

[danmg]

For an average male, that should be obtainable in about 6 months to a year.

[ambicapter]

You're ridiculous. You can say 315 is achievable in a year. 450 lbs doesn't even get on the charts for any weight up to 310 until intermediate level according to this chart [0]. Nobody with any sense considers themselves to be an 'intermediate' lifter after one year.

[0] https://strengthlevel.com/strength-standards/deadlift

[danmg]

These are self-reported numbers mostly from novices on the Internet. I can assure you these do not represent consistent and specific training for this lift.

A 315lb deadlift is obtainable within a month.