I’m not a scholar, but from what I understand of Catholic doctrine, we (humans) don’t know when end of times will be. Only God knows that, and anyone who claims otherwise, is not credible (my interpretation).
With God’s mercy, many will be saved, and again only God knows who they will be.
We are told to pray continuously for the world (Divine Mercy), the souls who have died, and Jesus’ return.
The only thing we do know with certainty about end times is who wins the final battle. Christ came once as God’s servant to die for our sins, this time “He will come again in glory”.
http://www.ewtn.com/Devotionals/mercy/coming.htm
God didn't write the scriptures for scholars...