Best use of time

Hi there I've been a fairly casual LoL player on and off who wants to improve. However, I don't have all the time in the world. Let's say that I had 100 hours to play. In that 100 hours, what would be the best breakdown to improve the quickest? Would it be 80 hours of play and 20 hours of watching pro players for example. Also, if I find myself losing a lot, when is the best time to take a break and come back later? I know it will be different for different people but what is the difference between 'I'm going to push on and try again' vs 'I should take a break'? To those who have successfully progressed beyond Bronze V, love to hear your tips. Cheers
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