Are you sure it was 8.6 seconds or maybe it was 8.5 or 8.7 seconds!!
With it not doing any work it should only prime after the pressure as dropped.
Reading the attached from the Maserati tech manuals, with the engine running, in neutral, the pump should not prime within 60 seconds.
As you have just changed the fluid, I don't think it will be anything serious, probably it requires bleeding?
Electric pump
The electric pump brings the oil from the hydraulic reservoir to the operational pressure
for the power unit.
The pump is driven by an electric DC motor and is managed by an ON/OFF control
strategy (the pump does not run continuously). The pump is activated when hydraulic
pressure drops below 40 bar and is switched off when the pressure reaches 50 bar.
When the driver's side door is opened and the ignition key is not inserted, the
transmission control module (NCR) runs the pump briefly to build up hydraulic pressure
before starting the engine.
Solenoid valves internal leakage
Leakage past the spool of the control valve, which is estimated by the NCR and can be
read out by the diagnostic system, constitutes a valuable diagnostic aid in the event of
an electrohydraulic system fault. The value shown is periodically acquired by the NCR
in a self-learning procedure.
Solenoid valve internal leakage in excess of 30 cc/min, combined with problems of
engagement and/or selection, offers an excellent point of reference to understand the
nature of the problem. In this case the solenoid valve must be renewed.
In the case of hydraulic problems use the following procedure in order to isolate the
offending component:
Key ON, Engine Off: the interval time between two pump activations must be no less
than 2 minutes. This makes it possible to check the solenoid valves - accumulator -
electric pump assy.
Key On, Engine running: the interval time between two pump activations must be no
less than 60 seconds. This makes it possible to check the clutch solenoid valve and, by
acquiring the pump restart times, the condition of the accumulator.
The conditions of the electric pump can be assessed by acquisition of its activation
time: an activation ramp with an increasingly gradual slope and activation time in
excess of 5 seconds are clear symptoms of deterioration of the pump.