I took a career break while my 3 children were very young. I so regret it. The process of getting my registration back is so long.
We've just completed our return to practice course (20 weeks at uni + 150 hours of supervised placement + 2500 word essay). Now we have to wait while they validate our results and send notification to the NMC, who will then send a pack out for registration.
You only need to do 20 short (7.5hr) shifts per year to avoid all that.