I'll refer to my notes (of 23 years ago). I kept the eggs/tadpoles at 23°C (73°F) so if your temperature's higher the following time scales may be shorter.
The eggs took 2 days to develop into tadpoles but it was 4 days later when they developed into actively swimming and feeding tadpoles started feeding on infusoria. This stage becomes obvious because they'll transform from their passive state and brown, cigar-shaped appearance into tiny black tadpoles constantly swimming at or near the water's surface.
It was 4 days later (day 10) when they were big enough to start feeding on newly hatched Artemia nauplii (brine shrimp). If you've not already got any good quality Artemia cysts I advise you to get some and start hatching them. Apart from their nutritional value, Artemia are bright orange and it's very easy to see how well the tadpoles are feeding because their bellies turn visibly orange with the Artemia.
When you get the tadpoles past the infusoria stage and onto brine shrimp, things then become very easy provided you develop a routine of setting up a new Artemia culture every two days or so, feeding the tadpoles as often as you reasonably can each day and maintaining water quality.
The tadpoles are very interesting in appearance and behaviour. Notable characteristics are their large eyes, the seemingly effortless way they glide through the water, the way they retain the tadpole body shape after all four limbs have erupted, the way they feed throughout metamorphosis and metamorphosis occuring in tadpoles of different sizes. Those were my observations anyway.
I found that the average rate of development from egg to frog was 8 weeks but, of course, this is largely dependent on temperature and frequency of feeding.