40 to 50 feet is plenty for saltwater if you're stealthy, but that's about where a zero G just starts to load properly for those 70+ feet casts. Had a chance to test drive a zero G 4pc #8 tip flex & it was little heavier than an old #6 weight, but thinner and so fast & effortless that it would hold 40 feet of line plus a 9 foot leaderin the air even on the backcast into a 25 mph wind! Shouldn't need much more than a single haul for casting, and with more practice to get the rods timing down you'll be at 70 + feet before you know it!