After people's experience of returning to the workforce full time after being a SAHM for a couple of years

I have been lucky enough to be able to stay at home raising my ds who is just over two now. I will be going back to work at some point, probably full time as part-time jobs are few and far between. DS goes to daycare two days a week for extra development and socialising and he loves daycare. I'd like to hear from other mums who have gone back to work full time after a couple of years as a SAHM. What was the adjustment period like for you both? How did you little one cope with 5 days? How long did the new habits/regime take to form and for things to be smooth? Any words of wisdom of advice?