Work in Watts.

Your radio wants 3.3v * 0.0175A = 0.05775 W

Your cell has 1.5v * 0.8Ah = 1.2Wh (ignoring discharge curve!)

A boost converter will lose probably 30% from the cell (which includes current to run the converter, and losses inherent in conversion)

So we can simply reduce the cell's capacity to account for those losses and call it 1.2Wh * 0.7 = 0.84Wh available

Therefore, after adjustment for losses of 0.84Wh available, and your load needs 0.05775W, you get to run for... 14 and a half hours by the numbers. Real world may vary.

You can of course work backwards too, if you want to run for 24 hours, you know you need 0.05775W * 24h = 1.386Wh of power, increase that for those 30% losses, 1.386Wh / 0.7 = 1.98Wh your cell has to provided to the boost converter. So if your nominal voltage is 1.5v then, you need 1.98Wh / 1.5v = 1.32Ah worth of cells (which is probably easily in the vicinity of 2 decent AA cells in parallel) to run for 24 hours.