Short answer: three truffle sessions in one week is not advisable in most cases.
If time is very limited, two sessions in one week can be the practical maximum. That only makes sense if the first session is well tolerated, the second is planned with tolerance in mind, and you leave clear space for rest and integration.
Psilocybin tolerance builds quickly, so sessions done too close together often feel weaker and less useful. Many people wait about a week to reduce tolerance, two weeks is better, and for deeper work 2 to 4 weeks is often more effective.
For a concise take on spacing and expectations, see this related Q&A. When in doubt, wait longer.