You can do this all in one field/formula, or multiple. For clarity, lets use 2 fields.
The first field would be the Duration. [Duration Field] = [Received Date]-[Date Issued]. This gives your number of days. Note that you may need to add a day to this depending on how you want it to count. For example, June 4-June 3, is that 1 day or 2? QB will say it is one, so if you want it to read as to append + Days(1) to the end of the formula.
The second field is a check. A formula checkbox for example would be fine.
[Was Target Hit Checkbox] =
var number DurationField = ToDays([Duration Field]) //QB sees days as a numeric value, which you need, versus the original field which QB sees as a duration and doesnt do well in math functions
//now a formula to check the box
If(
([Type of Request]="Bidder" or [Type of Request]="Convo") and $DurationField<=2, true,
([Type of Request]="New" or [Type of Request]="Supplier" or [Type of Request]="Existing") and $DurationField<=4, true
)
------------------------------
Mike Tamoush
------------------------------