Need a little reassurance

Lindsey

So my little one will be one month on Thursday. We’ve been breastfeeding and doing ok with it and he’s gaining plenty of weight. The last few days he’s feeds have become significantly longer. He used to feed for 20-25 minutes. And now he’s going 40-45. I think some of that might be comfort sucking? Not sure. Also, he feeds a lot longer on the right than the left. My left nipple was significantly more inverted than my right so I think the right might just be easier for him? Is all this normal? He did cluster feed almost all night so maybe it’s a growth spurt? Sorry if this is a dumb question, we’re still learning!