For me it depends on what you mean by weave. My girls are now almost 5 and 7. They do wear braids with extension hair added and have been doing so since they were 3 or so.
I prefer for them to wear their head braided because I do not have to manipulate their hair everyday. Having to get everybody ready in the morning and taking the time to get their heads right can get old. However I do style them in one or two puffs on occasion. In addition to the time element, I also have to add water or a product in the morning to get their hair into puffs that will stay all day. That's cool when it is warm but I
refuse to send my babies outside in the cold with damp or wet hair.
I do put in braids with their natural hair, however, the styles do not last as long. More so with one of my daughters with a slightly looser hair type than the other. Her styles always have to be redone sooner.
As far as the time spent styling for doing natural hair alone vs natural hair with extensions added. It is much less time for me overall when I add the extensions. Most of the time their braids with hair added take one to two hours and stay in anywhere between 4 to 8 weeks. Now I do maintain their hair by moisturizing, spraying the hair with a moisturizer and oiling their scalp with a light pomade or olive oil. I mostly cowash while in braids and I also shampoo when needed (when they get something in their hair) or at least every two weeks.
Oh yea, and my two have rocked a phony pony just for fun.
To me it's not about trying to impress anyone, it's about keeping their hair looking nice and being healthy within my time/money/styling abilities. The braids with extensions is what works best for us. I refuse to relax their hair and no longer relax mine.
My kids have never sat down to have their hair braided for 7 or 8 hours. Even my 7 year old would probably be trying to karate chop me at the end of the third hour.
In the last couple of months, they have been wearing more braided styles with just their hair but I am probably going to put in a set of braids with extensions soon. I think it is a good protective style. They like them. Overall, for me, they require less time. They are easy (for me) to upkeep. I can jazz them up with accessories, etc. I do not feel that I do styles that are age inappropriate and I do not use too much hair. My kids like their natural hair and they know that it is versatile.
If anyone dislikes it, that's their problem.
I do what works for me and mine. I do their braids (or my mother will when we visit) and I have never had a problem with edges breaking out or any kind of hair loss or breakage with braids.
Now if you are talking about sewn in weave, that's another story. But my girls will keep rocking their braids with extensions.