How much time do we have left?

We can get a clue about the end times in Daniel 12.

Daniel 12:1 "At that time, Michael the great leader who guards your people will take his stand. It will be a difficult time—nothing like it has ever happened since nations first appeared. But at that time every one of your people who is found written in the scroll will be rescued.

If we would follow the timeline from chapter 11 of Daniel, than we would understand we have arrived at the time of the Romans.
Jesus quotes from or refers to this verse in Matthew 24:21 where he says that "there will be great suffering such as the world has never before seen and will never see again".
The entire period from the year 70 to 1948 can be included in this, which is the period of the Roman Exile. It started as well as ended with trying to exterminate the Jews (by Titus and Hitler).

12:2 Many of those who sleep in the dust of the earth will wake up—some to eternal life, others to shame and eternal disgrace. 3 Those skilled in wisdom will shine like the sky. Those who lead many to righteousness will shine like the stars forever and always. 4 But you, Daniel, must keep these words secret! Seal the scroll until the end time! Many will stray far, but knowledge will increase."

Make sure that we are talking about raising the dead and the end of times in this chapter.

 12:5 I, Daniel, looked and suddenly saw two other figures—one standing on each side of the stream. 6 One said to the man clothed in white linen, who was farther upstream: "When will these astonishing things be over?" 7 I heard the man clothed in white linen, who was farther upstream, swear by the one who lives forever as he raised both hands to heaven: "For one set time, two set times, and half a set time. When the breaking of the holy people’s power is over, all these things will be over."

As we have seen in the Visions of the Woman with 12 Stars, the Two Prophets and the Whore on the Dragon, everywhere the period of 3,5 times, 42 months or 1260 prophetic days is the same. And they all refer to Daniel 12 here. This period is the Roman Exile.
The year that the breaking of the power of Israel is over, is 1948.

12:8 I heard it, but I didn’t understand it. "My lord," I said, "what will happen after all this?"
9 He said, "Get going now, Daniel, because these words must remain secret and sealed up until the end time. 10 Many will purify, cleanse, and refine themselves, but the wicked will act wickedly. None of the wicked will understand, but those skilled in wisdom will understand. 11 There will be one thousand two hundred ninety days from the time the daily sacrifice is stopped and the setting up of the desolating monstrosity.

The time the daily sacrifice is stopped is the year 70. This is also when the 'desolating monstrosity' is setup, because Jerusalem and the temple were destroyed. Daniel 9:27 also mentions this and Jesus refers to it in Matthew 24:15 and Luke 21:20 specifies that this is about the destruction of Jerusalem.

We know that the 1260 prophetic days run from the year 70 to 1948. That means 1260 prophetic days are 1878 real years in our time. Which is about 1.49 years per prophetic day.
If we calculate 1290 days from the year 70 on, we end up at the year (1878 / 1260 * 1290 +70 = ) 1993.

12:12 Happy is the one who waits and reaches one thousand three hundred thirty-five days.

Here it says it is possible that those 1290 days also might be able to last up to 1335 days.
With 1335 prophetic days we end up in (1878 / 1260 * 1335 + 70) = 2060.

It means something is going to happen between the year 1993 and 2060.

12:13 Now as for you, go on to the end. You will rest and will stand to receive your reward at the end of days."

It is confirmed to Daniel that this message is about the end of time and that he will resurrect. Since the topic of this chapter is the resurrection of the dead, we may say that will happen anywhere between 1993 and 2060.
From Thessalonians 4:13-18 and 1 Corinthians 15:51 we know that this happens when Jesus Messiah comes back.

Since we are living in 2019, Jesus Messiah could come back within 1, 5, 10 or 40 years.

This is consistent with what Jesus says in Matthew 24:32-36

32 “Now from the fig tree learn this parable. When its branch has now become tender, and puts forth its leaves, you know that the summer is near. 33 Even so you also, when you see all these things, know that it is near, even at the doors.34 Most assuredly I tell you, this generation (or race) will not pass away, until all these things are accomplished. 35 Heaven and earth will pass away, but my words will not pass away. 36 But no one knows of that day and hour, not even the angels of heaven, but my Father only.

 Jesus says that no one knows the day or hour, but we can know the season and when it comes close.