70 years and 7 years.
18 minutes (or 12 according to the Gra).
...the phases and stages of the geulah. 70 years may stop and start, depending on whether we are worthy or G-d forbid otherwise. 7 years perhaps as well.
Many gedolim of the last generations have referred to the events of the 70 years. More recent gedolim to the 7 years. And very recently to even the 9 months.
It would seem we're nearing the time when the process no longer may pause.
BS"D - בסיעתא דשמיא