4G 16 lasts 8-12 hours, so you may want to consider 15 Ga. I would recommend any 15 Ga poly for the mains and perhaps 16 Ga SpiralTek for crosses for a cheaper hybrid. Use FB if you have the $$. Expect to cut the strings out by hour 20. If you use anything other than polyester mains, expect 2-4 hours.