Or, potentially, you have less time to marry (among other things) when you go to school?

No, it's not a scheduling conflict. A child getting married is entirely about if the parents choose to force that child to be married or not. They were less motivated to marry the child, if the child was going to school, because an education is an alternative path to gain moneys, which is the parents primary motive. It's interesting how disgusting greed like this is wrapped in words, like "culture" that try to make it ok. It's a repugnant behavior, which is why there was effort to correct it, and we're reading about it here.