Not at all... Paul's letters often show a sense of urgency about the return of Christ, and also showing he expected it to happen sooner rather than later at a specific, distant point in time.
1 Thessalonians 4:15-17 For this we say unto you by the word of the Lord, that we which are alive and remain unto the coming of the Lord shall not prevent them which are asleep. For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and the dead in Christ shall rise first: Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord.
In these passages, Paul includes himself and those who might still be alive at Christ’s return, showing he thought it could happen within his life time.
Paul encourages believers to be constantly ready for Jesus’s return, rather than setting a specific time.
1 Thessalonians 5:1-2 But of the times and the seasons, brethren, ye have no need that I write unto you. For yourselves know perfectly that the day of the Lord so cometh as a thief in the night."
Here, Paul is very clear that the timing of the "day of the Lord" is unknown, and is going to come unexpectedly. Paul’s teachings also show that he considered his own time to be part of the "last days," a period extending from Christ’s resurrection to His return.
2 Timothy 3:1-5 This know also, that in the last days perilous times shall come. For men shall be lovers of their own selves, covetous, boasters, proud, blasphemers, disobedient to parents, unthankful, unholy, Without natural affection, trucebreakers, false accusers, incontinent, fierce, despisers of those that are good, Traitors, heady, highminded, lovers of pleasures more than lovers of God; Having a form of godliness, but denying the power thereof: from such turn away."
Paul describes behaviors and attitudes that were already evident in his time, showing he saw himself as living in these "last days." He also advises against focusing on specific dates or times, but rather on living righteously in anticipation of the Lord’s return.
Romans 13:11-12 And that, knowing the time, that now it is high time to awake out of sleep: for now is our salvation nearer than when we believed. The night is far spent, the day is at hand: let us therefore cast off the works of darkness, and let us put on the armour of light.
Paul tells the brethren to recognize how urgent the present time is without providing an exact timeline for the end.
Is this enough of a biblical basis my friend? It's clear that Paul preached an imminent expectation of Christ’s return without providing specific chronological details. His focus was on being ready and on righteous living in the present time, rather than predicting exact dates. This provides a "strong biblical basis" that Paul didn't have a specific chronological understanding of the "last days."
