Depends on which brand of woo one accepts and your depth of thinking.
Mormons: You get to meet all your dead relatives and are given your very own planet where you are literally god.
Some of the literalist evangelicals to seem to believe in an old man with a beard who lives in the sky. With the end of days comes ‘the rapture’ when all the saved go to live in the sky. They’re
bit short on details about exactly what you actually do for eternity.
From Catholic theology it is my understanding that god created time and space at the very beginning. That at the end of days, time and space cease to exist. There will be no sense of the passage of time in heaven (or hell) , just an omnipresent ‘now’.
However, in my experience , believers tend to cherry pick their beliefs,deciding on what the emphasis of their faith will be. It could be to spend their life helping others, or going around murdering abortionists. Or indeed coming to atheist forums to waste everyone’s time until they feel sufficiently martyred… Each extreme is still christian as they tend to have the same broad set of beliefs.