The amount you put into a remodel should be based on what is customarily found in homes in your neighborhood. In example, putting Italian marble floors into a home in a neighborhood of median priced tract homes would not be advisable.
Time is also not a particularly relevant factor. In the example above, the Italian marble floor remains what it is in a neighborhood full of linoleum floors with the occasional tile floor upgrade.
You can get an idea of the value you may be able to recoup from your investment at the URL below.