Renewal: auto Overboost

I'm really bad at programming my AI
like, REALLY bad ._.

I also like to afk with overboost
but sometimes she dies before she can recast it, even when the Azzy AI is set to ASAP
is there a way to code it so she will recast it before it expires?
like, 2-3 secs before as to avoid losing the buff and getting interrupted (which is usually what kills it ._.)

thanks in advance