Centaurus,
Our SOP on the the Lear 45 is to call;
When within 5 knots of any 'max speed' at any time in the flight propfile.
In the landing configuration when more than +10/-5 from the 'target speed'.
When more than +10/-5 from any required airspeed, such as V2 after a power loss on take-off or ATC assigned speed.
best regards,
Bruce Waddington