@marpow it's a bit complicated because they were working on dozens and dozens of songs that ended up on Let it Be, Abbey Road, All Things Must Pass, Imagine, etc.
A lot songs were recorded in January '69 or February to August of '69.
The spring/summer stuff was released as Abbey Road in September '69.
The January '69 stuff was held up due to the Let It Be film editing and various quality concerns and was released as Let It Be in May of '70.
For example Oh Darling, Polythene Pam, Something, Maxwell's, She came in through the bathroom window, etc were all around in January '69 but weren't finished until August '69.
Let It Be the album was almost completely recorded in Jan '69, though I Me Mine and Across the Universe overdubs happened way later in April '70.
Abbey Road took much longer, generally spanning February to August '69 recordings: I Want You was the first recorded (Feb 22, '69) and the sessions go until August '69.