The Lord is not slack concerning his promise, as some count slackness; but is longsuffering to you-ward, not wishing that any should perish, but that all should come to repentance. 2 Pet 3:9
Knowing that Peter was an apostle TO THE CIRCUMCISION, and that in all likelihood his intended audience were Jewish Christians, apply the 'Preterist Modifier':
“....although God in His longsuffering, not wishing that any should perish, but that all should come to repentance, allowed the two covenants to coexist for forty years, a generation, giving the Jews time to repent, but she would not.”
http://www.baptistboard.com/showthread.php?p=1608622#post1608622
See also:
"Consider what was coming upon 'that generation':
upon you may come all the righteous blood shed on the earth, from the blood of Abel the righteous unto the blood of Zachariah son of Barachiah, whom ye slew between the sanctuary and the altar. Verily I say unto you,
All these things shall come upon this generation. Mt 23:35,36
God made sure that every Jew on earth was given the chance to 'hearken to that prophet' before the wrath came. All the Jews of that generation on earth heard the gospel, and were given the chance to repent and avoid the wrath and the curses of the OT that were to come on the nation of Israel. Therein lies the fulfillment of 'the great commission' as many call it.
Many futurists, especially those of the pre-mil persuasion, totally miss the magnitude of the significance of the events of 'that generation', and woefully misapply passages to the covenant of grace that pertain only to 'that generation'."
http://www.baptistboard.com/showthread.php?p=1618185#post1618185