Keep in mind, these are (typically) large, vigorous-growing tropical plants. If you see roots growing out the drainage holes I would say that's a good sign that it is ready for a re-potting. My plants, all potted, ended up growing in huge, 24" diameter, 20-30 gal. pots. I had to use a hand-truck to move them around. I ended up dividing them since they all outgrew even these large pots. I gave the cuttings away.
