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"Contact time" in the table below is for mixed fermentations with [[Brettanomyces]]. Kettle sours or beers that do not contain live ''Brett'' can have a much shorter fruit contact time (generally 1-2 weeks). All contact times are assumed to be applied in secondary, and at the end of aging. Keep in mind that this is just a general guideline for usage amounts. Brewers should consider their base beer's characteristics such as abv, flavor profile, acidity levels, etc. when considering how much fruit to add. It is common for lambic brewers to age much higher fruit to beer ratios and then blend back with unfruited lambic to the desired g/L amount. If you are really trying to nail the perfect fruit amount, applying this sort of technique could be useful (assuming you have suitable beers around to blend back). This will allow you to try different blend ratios to determine the appropriate amount of fruit for your beer and desired outcome.
Fruit can be used for a 2nd steeping and second use of fruit can still provide flavor and color, but in a more subdued way than first use. Both Jester King and the Rare Barrel use fruit more than once, and Jester King reports prefering their second use fruit beers to their first due to more subtlety and balance<ref name='Jester King on the Sour Hour pt. 2'>[http://www.thebrewingnetwork.com/the-sour-hour-episode-15/ Sour Hour episode 15 - Jester King pt. 2]</ref> (~15 minutes in). Other breweries, including Cantillon<ref>[http://www.cantillon.be/br/3_102 Cantillon Kriek]</ref> and Upright<ref>[http://www.ratebeer.com/beer/upright-special-herbs/224318/ Upright Special Herbs]</ref>, also report multiple conducting steepings of fruit, at least at one point if not currently.
Don't be afraid to experiment outside of these guidelines.