Jenlu -
I will need to look up the greek "chronos" to refresh my memory here, but, I believe that as the angel saying, "Time's Up"! "No more Delay"!
Time had run out for that rebellious generation to repent and their judgment and the believer's vindication was imminent. God was MORE than gracious in giving them almost 40 years to turn to Him.
5 And the angel which I saw stand upon the sea and upon the earth lifted up his hand to heaven,
6 And sware by him that liveth for ever and ever, who created heaven, and the things that therein are, and the earth, and the things that therein are, and the sea, and the things which are therein, that there should be time no longer: Rev. 10:5,6