According to cited sources, the time of Christ’s Parousia is not determined by specific dates or chronological terms but is defined by a set of conditions primarily connected with changes in the internal state of the world and individuals, as well as with its unexpected, sudden nature.

Unexpected Dawn of Transformation

According to cited sources, the time of Christ’s Parousia is not determined by specific dates or chronological terms but is defined by a set of conditions primarily connected with changes in the internal state of the world and individuals, as well as with its unexpected, sudden nature. In one source it is stated that Parousia has the characteristic of being "unknown regarding time and terms, like a thief in the night," meaning that its moment of arrival remains hidden from people and cannot be predicted, unlike sequential stages such as the millennial Kingdom of Christ (source: link txt).

Another source emphasizes that the coming in the glory of Christ is linked with the inevitable transformation of human nature and the renewal of the world: "The Ascension presupposes the Parousia. Christ remains the same, but there is no longer kenosis... and it will coincide with his transformation. It is not the historical world that will witness the Parousia, but it will coincide with its transformation" (source: link txt). This indicates that a prerequisite for the arrival of the Parousia is the transformation of the Russian world and an internal renewal that alters the perception of existence.

Furthermore, it is noted that the Parousia will occur unexpectedly, with one source describing this event as "unexpected," even though it is not distant from the current state of being (source: link txt). Thus, the key condition is not the completion of calculated stages but the attainment of a specific inner state and a qualitative change in the nature of humanity and society.

Therefore, the time of the coming of Christ’s Parousia is conditioned by the following factors and requirements:
1. The unpredictability and suddenness of its occurrence ("like a thief in the night").
2. The accompanying transformation of the world and the change in the nature of the human soul—when the world ceases to be historical in its essence and a qualitative renewal begins.
3. The connection of this event with the final judgment and an internal division, when the purifying discernment between the pure and the impure in the human heart reaches its climax.

Supporting citation(s):
"Between Chiliasm and the Parousia there exists a difference, primarily in that the Parousia is unknown regarding time and terms, 'like a thief in the night' or 'the bridegroom at midnight,' and in this sense one should always expect it..." (source: link txt)

"The Ascension presupposes the Parousia. Christ remains the same, but there is no longer kenosis: this is the Advent of Christ in Glory, evident to all. … It is not the historical world that will witness the Parousia, but it will coincide with its transformation..." (source: link txt)

"Where there is Christ, there is always salvation, there is eternal life too. … The Parousia is not near, yet not distant, and it will come suddenly..." (source: link txt)