The rail timetable for the Leeds-Settle-Carlisle line changes from the 6th July from the 'Key Workers Timetable' to the 'Temporary' timetable.
The temporary timetable will give a maximum of 11 hours and 18 minutes from the Leeds end to complete the challenge with a 'forget it' time from the Carlisle end. You can download the timetable here.
https://www.northernrailway.co.uk/timetables - Route 7.
Essential journey's only of course at the moment - for your physical and/or mental well being?