I'm glad to, but I'm afraid I don't have the time.
我很乐意,但我恐怕没时间。
Some stories are for swallowing. Imagine that you have found a good story, and, what is even more important, the time to enjoy it. You might be on holiday, or on a long train journey. If it is a good book, you might say, It's so good I can't put it dow