Author Cliff Notes- Wordcount Goals
There's no hard rule about how long your book should be, but there are industry standards to aim for. Chapter length is up to the author.
1000 - 8000 Short story
10,000 - 18,000 Novelette
20,000 - 50,000 Novella
Traditionally published novels usually run in the range of 80,000 - 100,000.