When to light chanuka neiros

[yisroel]

theres some more detail in this thread

Chanukah candles and shabbos

wanted to follow up on this. if I light the menorah 18 minutes before shkia, and if tzeis is approx. 35 minutes after shkia, the menorah will have been let for 53 minutes by the time tzeis arrives. this means that the menorah will only burn for another 5-10 minutes after tzeis. is this enough?