Such blanket statements like these are unhelpful and downright misleading. QR's hub model optimises the connection banks to provide shorter overall journey times. This doesn't give you that much flexibility to cherry pick your connection times. For most itineraries, it'll be around 1-2hrs, with the next one being 8-10hrs, with relatively few in-betweens. A hub like DOH was purpose-built to facilitate connections, which makes a sub-1hr connection is perfectly doable.