Why wait for some time in the future to be with God when God can be found right here and now? That sounds like a recipe to ensure that we never experience the kingdom while we are alive which is when it's meant for. "He is not the God of the dead, but of the living..." Luke 20:38
Folks usually leave off the end of the verse, which is the whole point: "for they are all living TO HIM." This refers to the Father who keeps all of the dead
in His memory, til one day in the future He will give Christ the go-ahead to raise all of the dead from their graves. (John 5:28)
The Kingdom will come. Jesus indicated that it is associated with the will of God being done here on Earth, as it is being done in Heaven. (Matthew 6:9,10) God's will certainly isn't being done now. His own government will take care of all of mankind's problems. Why would Jesus tell his disciples to pray for this kingdom if they already had it?
The OP asked "how much longer?" Did anyone check out the website
www.jw.org and type in "Immense Image of Daniel chapter 2" in the top right-hand corner? It explains how we can tell where we are in the stream of time, by looking at where we are on this image.