So, currently, that marathon would be
TPM
AotC
TCW
RotS
Solo
OWK
Rebels
Rogue One
ANH
ESB
RotJ
Mando
BoBF
TFA
TLJ
TRoS
If I tried this, I’d probably cut out TCW and Rebels just because of how much time they’d take up. I’ve never done this, but I did something similar as a kid when I watched 1-6 with the Clone Wars microseries between II and III.