If someone in the market talks to you about hold time, ask them to confirm what they mean before replying. Moreover, trying to define a time period doesn’t work because it’s going to differ in different circumstances, in different markets, with different latencies and different systems, so I don’t see 4/6  BIS central bankers' speeches  that as feasible.
Taking stock of the policy response to the ongoing research on ageing, I guess it is fair to say that the results so far have been mixed. *  *  *  On the plus side, one can not deny that ageing features prominently on the political agenda and, in many countries, significant steps are being taken.