You need to keep your investment in government bonds in order to support your Greek Golden Visa application at the same time period you hold your Greek Golden Visa rights for a resident permit.
How long do I need to keep my investment in government bonds to support my Greek Golden Visa application?
I read the requirements of the government bond investment option of the Greek Golden Visa, and understand that the bond I purchase must have a residual maturity of at least three years. Does this mean that my initial resident permit will only be valid for three years? How long do I need to maintain my bond investment to make my resident permit permanent?
If you want to maintain the residence permit, you should then keep the investment in bonds as long as you want to hold a Golden Visa.
Regarding the Implementation control and investment retention, as long as you keep the investment either the initial one or another one of the listed options in the Law, you are entitled to keep your permanent residence permit.