I think one ought to have a goal of getting through the whole oral and written law, plus basic physics and mathematics. --at least once. You can see in the writings  of the Gra the importance of getting through the whole oral and written law plus the seven wisdoms. 

But how can one accomplish this?--that is by the way of learning called ''girsa'' i.e., just saying the words and going on. That is, to have one session in Gemara i.e.,  to make a place marker and  go through one side of a page of Gemara, Rashi, Tosphot with the Maharsha and Maharam printed in the back of the Gemara. Put the place marker in, and the next day to go on to the next page. Do the same with the Yerushalmi and Midrash. Plus go through daily a few pages of Physics and Mathematics. But all of this is what is known as ''bekiut''. Besides this, one should have a few in depth sessions with the Avi Ezri of Rav Shach or the Chidushei HaRambam by Reb Chaim of Brisk.     [ Mathematics in depth is not all that different from the fast learning called ''girsa''. The difference is for every chapter you go forward, you go back to all the previous chapters.]

Another aspect of learning in depth I heard from my son Izhak--that of doing lots of review. [The gemara mentions review forty times.But that should be done separately from the fast kind of learning i have mentioned up above. ]