After receiving green-card, how long do I need to stay with current employer?

[marica.marius]

If I leave my employer after 4 months of receiving green-card, can my employer withdraw the I-140 or the green-card?

Will that affect my naturalization application?

[azblk]

If I leave my employer after 4 months of receiving green-card, can my employer withdraw the I-140 or the green-card?

Will that affect my naturalization application?

Your employer can not revoke your green card. You can leave anytime you want to.