Irregular periods after breastfeeding is finished

Hi I was hoping someone could shed some light for me. I was breastfeeding solely for 7 months, once i started back to work (covering for someone temporarily for a week) i was breast feeding less which started my period again. Two month later I reduced my breastfeeding and combination fed.

I have been completely finished breastfeeding for a month now.

Since the periods started my cycles fluctuated from 42 day cycle to 28 and 30. This month is the first month with breastfeeding and my period is 32 late and still not here.

Is this irregularity normal? And how long does it take to go back to a normal similar cycle each month?