In other words 4 months between convoy and the aircraft leaving TLS.
But this was during the peak times when Airbus produced about 30 airframes per year. I guess they are not that pushy anymore, neither Airbus nor EK.
Over the past few years, completed and outfitted airframes have often been sitting in XFW for several months before delivery to EK -- there typically has been a burst of deliveries at year-end which really didn't match the expected cadence of one or so per month from the production line. In 2018, EK took delivery of four A380s in November and December (Airbus delivered 13 total in 2018). EK took six A380s in the last 32 days of 2016. They accepted three of the eight delivered last year in November or December.
IMO Airbus was working very hard with its customer to push deliveries out as far as possible while still hitting contractual delivery targets for each year.
FWIW once the decision was taken to end the program, it would have likely made the most sense to produce the remaining orders in the backlog at the most efficient production rate possible, even if that means some airframes sitting at XFW for several months into 2021. The customer is financially sound so they'll be delivered and slowing production even further would likely increase costs.