There is always a parliamentary recess giving them a holiday but proroguing for this length of time is unprecedented.
"House of Commons Library stats reveal that since 2010, the average prorogation has been eight days long. And that figure has been dragged up by a relatively long 20-day period in 2014, which included the European parliamentary elections and the Whitsun recess.
The same report finds that “in the last 40 years Parliament has never been prorogued for longer than three weeks: in most cases it has been prorogued for only a week or less.”
Never five weeks before a monumental decision. Spin it all you like, just like BoJo is doing, it is unprecedented and that is why there is outrage about this which we have never seen the like of.