How much administrative experiences help for a faculty appointment?
In general, being a university administrator (e.g., Dean or Provost) is good experience for being a university administrator. I do not recall any high level administrators changing countries, so my guess is that the experience is country specific. For traditional research and teaching faculty positions, prior experience as a university administrator is not helpful. While hiring committees try and take into account the "lost time" associated with being an administrator, in general, I think administrators trying to switch tracks are at a disadvantage.