genral incident

Hi I don’t how to pit this across so can you please correct it grammatically and help me to make it in advance level…
My frirnd told me her department has come up with a shift in which you work for 11hrs four days a week and 3days offs.But its very hectic because there are 75 calls in queue(person works in a call centre)

Hi. I don’t how to put this across, so can you please correct it grammatically and help me to make it better?

My friend told me that her department has come up with a shift in which you work for 11 hours a day, four days a week, and then get 3 days off. But this is very hectic because there are 75 calls in a queue. (The person works in a call centre.)