People tend to measure whammy pull-up on the G or B string 12th fret.
My Jems are set up so it pulls up 5-6 semitones. (a fourth/raised fourth)
For reference I also checked the low-E, there I can pull-up about 8 semitones (a flatted sixth)
Hwo far you can go depends on the shape of the trem and the trem cavity, it will 'bottom out' somewhere. With the
cavity cover off, you may be able to see where this is.
If you use more than 3 springs you may also 'bottom out' on the springs, as you can open springs but you can't close them.