In my opinion, Orthros should definitely be an hour and a half, or at least more than 1hr 15min. It tends to feel rushed a lot of the time because when the bulletin says “liturgy” at 10 most of the laity do not want to arrive just to find that liturgy has not started yet, which some will complain about.
I feel, if chanters are actually given the time, to do the canons as lined up in the “full orthros” sheet in the orthros excel: Ode 1,Ode 3, Mid Ode Kathisma #1, Glory… [Both Now…] Mid Ode Kathisma #2, Both Now.. Mid Ode Kathisma #3 (if it exists), Ode 4, Ode 5, Ode 6.
Everything after ode 6 can be spoken until the katavasia, since it is mentioned in lesson 7 that odes 7 and 8 are hardly done, and if they are, they are spoken, and since the kontakion, oikos, and synaxarion are already spoken, that makes more sense, in my book.