This is something I hear a lot. It is simply not true. To read 10 pages you need 10-20 minutes. If you do this daily, you read 300 page book in a month.
It is one trip by public transport. Or reading between meetings instead of checking Instagram. Or opening a book during lunch or dinner instead of scrolling on the phone. Or reading a book on the toilet instead of Facebook posts. Or getting up 15 minutes early. Or going to sleep 15 minutes later.
You have time to read, you just do not. Do not lie to yourself and others.