Of the four candidates reportedly under consideration if we sack Ten Hag, only Thomas Frank would be coming here off the back of a 3+ year stint at another club. Presumably, he is your first choice if we dispense with Ten Hag's services? Pochettino and Tuchel have both managed 5 year stints previously (at Tottenham and Mainz, respectively), but both have largely been on two year cycles ever since. McKenna doesn't even have 3+ years managerial experience in his career, let alone at a single club.
Perhaps also worthy of note, other than Guardiola's 4 year period at Barca, no manager has lasted more than 3 years at Barcelona, Bayern Munich or Real Madrid at any point in the last 20 years, and yet they have won 34 league titles and 11 Champions Leagues between them in that period.