in no time @ 英語學習筆記

Peter: What happened to you? Your black eye circles make you look like a panda.
Diana: I haven't been sleep well recently. The seventh Harry Potter book is going to be released soon, you know. I'm looking forward to finding out now it ends, but I'm so scared that Harry Potter will die.
Peter: Come on! He's just a fictional character!
Diana: To me, he's more like a friend who has accompanied me for six year. Once I get a copy of the last book, I'm sure I'll finish reading it in no time. I can't wait to see if Harry survives!

解析：in no time == soon, quickly (馬上)

in no time == in no time at all == in less than no time

fictional