Commercial Fixed Wing
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 105; Flight Crew Type 12000
Workload; Time Pressure; Communication Breakdown; Physiological - Other; Situational Awareness
Deviation / Discrepancy - Procedural Clearance; Ground Incursion Runway; Ground Incursion Taxiway
Air Traffic Control Issued Advisory / Alert; Air Traffic Control Issued New Clearance; Flight Crew Became Reoriented; Flight Crew Requested ATC Assistance / Clarification
Environment - Non Weather Related; Human Factors
At the gate we received a message that we needed to push early; or on time; due to ZZZ Center closure for COVID cleaning.  We pushed back and taxied west route to Runway XL.  Halfway down the taxi; by [Taxiway] 1F on [Taxiway] 1; we received a takeoff clearance for [Runway] XL.  As I pulled out onto the runway; the FO advised me I entered the runway at [Taxiway] 1D and not [Taxiway] 1C full length.  I started a back-taxi for full length and we received a clearance from Tower at [Taxiway] 1D for cleared for takeoff; and we had traffic on four-mile final.  When we took off we were between [Taxiway] 1C and behind [Taxiway] 1D.  Additive conditions were being off for three weeks.  Takeoff at night on unfamiliar runway direction usually is [Runway] XXR.  Getting takeoff clearance almost one minute prior to takeoff during taxi. ATC zero hour for destination COVID cleaning was a distraction trying to get off in time before ATC closure.
While taxiing to [Runway] XL for a nighttime departure; we were cleared by the Tower to line up and wait well ahead of the runway end; roughly [Taxiway] 1F. As we had just completed the Before Takeoff Checklist after a single engine taxi and engine start; I was a bit behind in setting the Departure frequency. I went into the EFB to find the frequency; and when I looked up I realized we were turning onto the runway at [Taxiway] 1D. I alerted the Captain that we weren't at the end. At the same time; Tower advised us we were at [Taxiway] 1D; but cleared us for takeoff with traffic on four-mile final.The Captain had already started a bit of a back-taxi; and upon hearing the traffic report we discontinued the back-taxi; lined up and departed. We were not at the very end; rather somewhere between [Taxiway] 1C and [Taxiway] 1D; but behind [Taxiway] 1D. Upon reflection; we decided that our takeoff data may not have been valid since we were not sure of our start point. Additive conditions were an ATC zero hour at destination and the Captain admits his three weeks off prior to our day put him a little behind. I also didn't advise that my head would be down while taxiing out.Better verification of runway departure point and better awareness of taxi diagram.
Air Carrier flight crew reported a taxiway/runway incursion and cited being rushed to beat an ATC Zero time contributed to the event.