How much content is there in Act V in Diablo 3: Reaper of Souls relative to other acts? For example, Act IV is generally considered to be around half as long as Acts I-III.
Qualifications: Assume that I am playing on an appropriately-challenging difficulty level (i.e. not cruising through on Normal with a pimped-out character), not attempting any speedrun shenanigans, and am experiencing the content for the first time.
(I'm aware that the RoS expansion adds plenty of additional content in addition to a new act, but I'm just asking about the additions to campaign mode.)