How do these parables explain time in Heaven? In many of the parables, Jesus speaks of a time span completing some event.

Examples include: 


  Mark 13:34: For the Son of Man is as a man taking a far journey, who left his house, and gave authority to his servants, and to every man his work, and commanded the porter to watch. 
  
  Math 25:14: “For it will be like a man going on a journey, who called his servants and entrusted to them his property. Math 13:33 The kingdom of heaven is like leaven that a woman took and hid in three measures of flour, till it was all leavened.
  
  Luke 13:06: “A man had a fig tree planted in his vineyard, and he came seeking fruit on it and found none. 7 And he said to the vinedresser, ‘Look, for three years now I have come seeking fruit on this fig tree, and I find none. Cut it down. Why should it use up the ground?’ 8 And he answered him, ‘Sir, let it alone this year also, until I dig around it and put on manure. 9 Then if it should bear fruit next year, well and good; but if not, you can cut it down.’”, 


If God is out of time, how is he waiting to return from heaven?
Keep in mind that there is a difference between a parable and an allegory. In an allegory, there is a very close correspondence between each point of the story and the situation the author wishes to explain. If, for example, the story you point out from Luke were an allegory, then not only would the owner of the vineyard represent someone specific, but the vine dresser would represent someone else, the vineyard would represent someone or something very specific, the three years would, the manure would, and so on. I don't think that's the case for this story. Instead, the point of the story is simply that God has patience with those who do not follow him, but that this patience is not unlimited (perhaps because it will cease on Judgment Day, or on the person's death).

Similarly, as with all parables, the other ones you point out are intended to focus on a specific point; the story does not require that every single one of its elements refers to some specific real entity.

Thus, the question of whether there is time in Heaven or not is not addressed by the parables&mdash;they use images of time to get a point across, and the point is largely about what our behavior in time ought to be, not how God is affected by time.