I have 400 on windows. It's a little easier, since it's in 2 rows, but still that's 200 columns. I admit I am not F2p, but I don't regret buying them at all. It is so convenient even at high level, that I can usually find 100+ of every long growing crops. There are so many help requests each day for crops like potatoes, trees, roses, jasmines, that I couldn't even grow them myself and definetely couldn't store that many. Not to mention the zoo tasks (windows has the old zoo).
Also when I use the heli booster, I buy everything from the market (except crops) and I can complete way more orders, than I could without them. Sure, you don't find everything, but finding 5 beds instead of 2 is still pretty good. My goal is 500, after that I will definetely stop. I know some have over 1000, but that is just too much pain to go through for me...