When was the Veil implemented?

Some more veil quotes I feel are helpful:

Law of One - 83.17
Questioner: Could you expand on what you mean by that interaction of polarized entities in piercing the veil?

Ra: I am Ra. We shall state two items of note.

The first is the extreme potential for polarization in the relationship of two polarized entities which have embarked upon the service-to-others path or, in some few cases, the service-to-self path.

Secondly, we would note that effect which we have learned to call the doubling effect. Those of like mind which together seek shall far more surely find.

Law of One - 83.18
Questioner: Specifically, by what process in the first case, when two polarized entities would attempt to penetrate the veil, whether they be positively or negatively polarized—specifically by what technique would they penetrate the veil?

Ra: I am Ra. The penetration of the veil may be seen to begin to have its roots in the gestation of green-ray activity, that all-compassionate love which demands no return. If this path is followed the higher energy centers shall be activated and crystallized until the adept is born. Within the adept is the potential for dismantling the veil to a greater or lesser extent that all may be seen again as one. The other-self is primary catalyst in this particular path to the piercing of the veil, if you would call it that.