Its not too bad, atleast I learnt that monks where a good place to train from the first few posts. I used to train on warriors at Al Kharid palace and use salmon as food.
=/ I have a new str/atk f2p....It takes longer than that..I have 30 atk , 34 str now..But no way you can do it in 4 hours or less. (40 atk, 40 str - Sounds easy..but really isnt)