How long is a decree nici valid for?

I wonder, does anyone know if there is a time limit on how long a decree nici is valid for? I'm thinking of the situation where a husband and wife have pursued a divorce to the point of having a decree nici issued by the court and then become reconciled and wish to remain married. Is it the case that the decree nici forever more remains in place as a niggling "quick get out?"

Once a nisi has been issued, the petitioner can after 6 weeks and 1 day apply for the absolute

The respondent can apply for the absolute a further 3 months from that.

The nisi will remain in force until either of the above are instigated or for up to a period of 12 months longer, subject to the court accepting reasonable reasons to then issue the absolute.

In theory the nisi can remain as is indefinately, but if the couple live together as man and wife for a period or periods totallling six months after the issuing of the petition and admit to that, then the court cannot grant the divorce.

Hope this has some help