How Many Times, How Often, What Temperature
noun
If someone asks you what occurrence or what degrees they're really trying to ask you how many times something happened. Sometimes they're asking what temperature it is too.
なんど
The reading is a combination of kun'yomi and on'yomi readings. That being said, both readings for both kanji are the readings you learned already, so you should be able to read this.
この曲は一年に何度も思い出す名曲です。
This song is a masterpiece that I remember many times a year.
同じレストランで同じものをオーダーしたことが何度もあります。
I have ordered the same thing at the same restaurant many times.
何度もファンレターを出したけど、中々返事が来ない。
I wrote a fan letter many times, but I didn't get a reply.