If you're cutting it so close that you need a chart, perhaps you should just stick to the lower sampling rates. Or get a second or bigger card. Throw in voice activation recording modes and any charts go out the window.
A CD is 16/44.1 for 2 channels at a cost of 700MB per 74 minutes. Over simplified to 1GB an hour. If you're going to be recording 16 hours of content in a single sitting, you've got greater needs than a chart. Anyway simple math can be applied to the CD quality specs to derive most approximate file size to time ratios. 24 bit would be 150% of 16 bit, or 1050MB per 74 minutes. Still basically 1GB an hour. 5.6 DSD for 2 channels rounds up to about 6GB an hour, a little closer to 5, but always nice to play it safe.
Unless you have some variable track count that you need to account for, I'm not sure why you'd need a chart. At any rate, any decent recorder should give you time/capacity left as well as battery life remaining. It might not be easy to find or accessible while recording, but a feature on many stand alone devices.
Topic: WAV File sizes chart (Read 13936 times)