Time and space are considered as a twin and interdependent phenomenon. Time may be defined as a distance between two points in space. Simply speaking, if a person moves from point A to point B, the duration required for space travelled/ covered between points A and B is called Time to reach from A to B. in other words, if space between A and B is expanded, the time to reach from A to B will be expanded; and if the space between A and B is contracted/condensed, time to reach from A to B will be shortened. It means same event (in this case moving from A to B) will require more (expanded) time to happen, if space is expanded; as that event will require lesser time to happen, if space is condensed/ contracted. This concept of time and space may be substantiated on the basis of Quran.
Sura al-maarij states that “Lord of the Ascending Stairways. The angels and the Spirit will ascend to Him in a Day the extent of which is fifty thousand years” (al-ma,arij-3,4). These stairways or gates are used by Hazrat Gabrael (as) and other angels to reach to such divine proximity from where they receive commandments from Allah, and such ascendance of angels from earth to seventh sky happens within a DAY (twenty four hours) which is actually equal to fifty thousand years on earth. It means events happen quicker on 1st sky as we move from 1st sky to upper skies; the events occurring in fifty thousand years on earth take one day/24 hours in seventh sky to occur on earth. In other words, one second spent in the seventh sky would be equal to 211.22 days spent on earth; it means the events which are seen to be happened in one second in seventh sky would happen in 211.22 days on earth. That is why Allah states: “Indeed, they see it [as] distant, But We see it [as] near”(al-ma,arij-6,7). It also explains why 'meraj' was possible only within a part of night; the events witnessed by Hazrat Muhammad (saw) during the ‘journey of meraj’, would take thousands of years to take place according to earth time. It also explains return of Hazrat Masih (as) from an upper sky (i.e. fourth sky) to earth as much young man as he was at the time of his exaltation - he would have stayed in the upper sky for a short period of time, but events happened in that short period would have taken thousands of years passed on earth.
Now we can calculate exact time spent so far by Masih (as) on the upper skies.
Suppose, you see the process of victory of Pakistan over India in one minute on seventh sky; and suppose you require 50000 minutes to see that victory on earth. If, after returning to earth, you require 40000 minutes to see that victory on earth, it would mean you have returned to earth after spending 1/5 minute on seventh sky; and when you returned, 10000 minutes of process of victory had already passed on earth. if you require 25000 minutes to see that victory on earth, it would mean you spent 1/2 minute on seventh sky, and when you returned, 25000 minutes of the process of victory had already passed on earth. In other words, the greater the part of event had passed on earth, the more you stayed on seventh sky. Now you can easily calculate how much Hazrat Isa (as) has stayed in upper sky so far. Supposing he is in the seventh sky ( according to one source he is in fourth sky), we can calculate that he, upto now, has stayed in the upper sky for only 0.04 day (2000/50000=0.04).(2000 is number of years passed on earth so far after Masih's exaltation; 50000 years on earth is equal to one day on seventh sky).