Medium Transport
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Situational Awareness; Training / Qualification; Communication Breakdown
Deviation - Altitude Crossing Restriction Not Met; Deviation - Altitude Overshoot; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter Weather / Turbulence
Flight Crew Became Reoriented
Environment - Non Weather Related; Human Factors
The mission was a short flight. Aircraft was level at 3;000 feet after initial climb when clearance was received to climb to 5;000 feet.  I thought I heard 9;000 feet and both of us failed to confirm with each other due to short communication from person in jump seat.  I began a rather aggressive climb to exit the turbulence and detected command bars moving downward as I passed 5;100 feet.  I reduced power and returned to assigned altitude while verifying clearance.  Aircraft reached 5;450 feet.  Total time above 5;000 was approximately 8-10 seconds.  No communication from ATC or action required.Due to COVID-19 slowdown I had not flown in 4 weeks and my last flight before that was 5 weeks before that.  Clearly flight discipline suffered from lack of recent experience and teamwork.  I allowed a distraction to prevent me from completing an altitude readback with PNF and neither one of us performed the '1;000 feet to go' call prior to reaching assigned altitude.
Corporate Captain reported an altitude deviation during climb and cited lack of flying as a contributing factor.