It takes about 10 minutes to play through the romberg c manjor sonata (for me anyway). Then also I'm working on Squire's Tarantella + songs from suzuki book 2. I still need to improve a lot at just the romberg but simply playing through the whole thing twice plus spending similar time on the others is all the time I've got. Decided it's better to focus on particularly troublesome spots in the romberg, etc on an almost daily basis (almost because I work exhausting 14, 15 hour days) and just go many days where certain parts aren't played at all. I think in the long term I'll improve more this way. I won't quite try to bother to explain why. It's almost obvious, yet I've practiced partially wrong for the last few months.