Exclusive pumping

Hi mom's. I EP my 6 week old. I pump every 3 hours for at least 20 minutes. Normally at 12am, 3am, 6am, 9am, 12pm, 3pm, 6pm and 9pm. If I were to add an extra pump in at 11pm and 11am could I get away with going a 4-5 hour stretch in the morning hours? Or if I had to work going two 4 hours stretches? Ideas?