Yep, normal range is 3x a day to every 3 days. More or less is possible but that should be checked by a doctor. If it was always once every 5-7 days it's probably nothing and normal for you. If something changes about the rhythm then go see a doctor and that can mean you're one of the once every 3 days people and now you poop daily. Even if it's inside the range, go see a doctor!
And one myth: if your body is the slow type like every 2-3 days or even 3-5 days fibre and stuff won't help, it's just a heavier poop (in weight) after 5 days than usual.
One time me and my girlfriend (now wife) went to visit my grandparents at their winter home in Texas. I say home, but it was just their RV that they drove down in the winter to avoid the snow. Anyway, It didn't want to blow up the RV with a huge steamy log, so I held it in for a few days. On the night of the 4th day, we ended up going to a swimming pool. While changing into my swimsuit in the locker room, I realized they had nice toilets there and it would be a good opportunity to unload.
I don't know what I was expecting, but for some reason I wasn't planning on 4 days worth of shit coming out at once. Not like soft, mushy turds, but one big strong firm log that just kind of piled up in the bowl like a shit pile pyramid.
I tried to give it a courtesy flush before I wiped, as is my custom, but that puppy was too big to go down. Seeing it was in a public toilet, it's not like I had a plunger or anything. I tried flushing a few more times, but the water was getting dangerously high in the bowl and I didn't want to deal with a turd water tsunami. So I had no choice but to leave it and duckwalk over to another stall where I could wipe my asshole before fleeing the scene.
So yeah. I guess my apologies to whoever had to eventually deal with that at the Brownsville Texas RV park circa 2005.