wat do you mean by normal life???
like you can walk unaided, climb stairs, and set normally??
let's see if you lengthen 1mm/day for the first 3cm you need a month. 0.75mm/day for last three then this 40 days... +5days
this 2.5 months..
some patients take 3months to be able walk close to normal, some even more, it depend if you have any complication or no like if you got ballerina foot or so ..
but I think in best case scenario you'll take 5-6 months