Chazal tell us that to fulfill the mitzvah of learning yomam valayla one needs to…
I cannot finish the sentence because chazal said not to publicize the minimum requirement so that people will not satisfy themselves with this amount. Rest assured that this amount can be easily met by someone who works.
Never in our history did the masses learn all day. Never.
For those who can do so PRODUCTIVELY it is wonderful. But there is no requirement for everyone to do so. Those who waste their time in Yeshivos and Kollelim will have to answer for bittul zman and depleteing the funds from those who are shteiging with mesiras nefesh (not to mention taking money from hard working baalei baatim who give from their hard-earned money to support their learning).