Basically, anything that's not next business day is a delay due to risk. (well, except for online bill pay, which can be printed checks that are mailed out.)
Depending on the risk profile of the business, we've done an array of things from 0 day simultaneous ACH credits and debits to 3 or more day holds on incoming funds (via ACH) before credits can go out. Obviously, the riskier the business, the more expensive it is to go fast. 3 day holds are pretty common, since any NSF sort of return is supposed to happen in that time frame.
Depending on the risk profile of the business, we've done an array of things from 0 day simultaneous ACH credits and debits to 3 or more day holds on incoming funds (via ACH) before credits can go out. Obviously, the riskier the business, the more expensive it is to go fast. 3 day holds are pretty common, since any NSF sort of return is supposed to happen in that time frame.