The Utopia Truffle, together with Hollandia, is one of the strongest strains there are. This strain is also special due to its taste. Compared to other truffles, this strain is not so bitter and has a rather mild and nutty taste. 

For most people, an amount of 2-3 grams is enough to notice clear effects. You should not ingest more than 7,5 grams at a time. 
First effects are likely to be felt after around 30 to 60 minutes and last somewhere between 3 to 6 hours.  

You can eat Truffles or use them as a tea (let it simmer for 20 minutes, don't let the water boil).

BE AWARE that these amounts are averages and can vary from person to person. Always start with a low dose.