How many cells can I transduce with the amount of lentiviral vector particles provided?

The number of cells that can be transduced with lentiviral particles will depend on how permissive the intended cell-type is to lentiviral transduction, the target gene, the MOI used for the transduction as well as the amount of virus you order (e.g., 100 µl or 200 µl). Hence using a control to identify the functional titer in the target cells and testing empirically a range of different MOIs is the most reliable way to address this question.