It would seem that the 1,290 days is the period starting from the most drastic measures of Antiochus Epiphanes to the end of the 1,000 years of which Revelation 20:1–15 is speaking. The additional forty-five days to get to 1,335 days would then point to the short time in which the devil is let loose. Here too we are dealing with symbolic numbers of which we cannot calculate the exact length.
It is very important that until the time of Christ’s return we continue to ask that the Spirit will give us the strength of faith and love to persevere in a life with the Lord. Pray to be and remain truly wise, by following the course that the Lord sets out to us in his Word, no matter what the world says about it or how it may threaten you.
12 Blessed is he who waits and arrives at the 1,335 days.