Fun trivia: the word canal, and related words like cane, are most likely the only words in modern English derived from the ancient Sumerian language (from 𒄀𒈾, "qi.na") - spoken by a culture that has not just been extinct for four thousand years, but it was completely forgotten until they dug them up again in the late 1800's. Then it took another half century to figure out they were not just the later Akkadians, who are also extinct but at least referenced in the Bible.
Sumerian city-states were very much in the Bronze Age, and yes, they built canals. Lots of them in fact! Luckily, this culture also had a writing system (in fact, they invented writing, effectively ending the prehistory), and they wrote down, directly or indirectly, how much time the various activities took, as a way to record their economy. This is the resource as close to the source as you can get, as no other early Bronze Age cultures had writing systems. You might want to ask a question like this on History.SE as well.
Anyway, this page provides some incredibly detailed resource and time estimations for a canal. It also shows that there's a lot more to canal-building than just digging. The sides were lined with bricks and bitumen to prevent leakage, clay for those bricks had to be dug, reeds harvested to fire those bricks, etcetera. It's quite a process.
For excavation only: the canals were dug in three "levels". The first, digging up to 0.75 metre deep, allowed for one labourer to move 6 cubic metres in a working day of twelve hours. For the second level, 0.75 to 1.5 metre depth, only 3 m³/day was possible. And for even deeper, 2 m³/day was the max. That can be because of either soil hardness or because it takes more effort to move up the dirt.
So, assume your canal is 6 metres wide, which is on the small side for Sumerian canals but doable, especially if this canal is not meant to be immediately navigable. It would take 7500 man-days for the first level, 15000 man-days for the second level, and if you make your canal 2 metres deep, another 15000 man-days for the third level. That's 37500 man-days in total, or 150 days if you've got a labour force of 250 men who do nothing but digging.
But, if you want this canal to be any more permanent, you have bake bricks, boil bitumen, and so on. See the website for more info about that.
Alternatively, if all you care about is getting water from A to B, without caring about navigability, then the width and depth of @Harper's answer (2m wide, 0.5 m deep) would be appropriate. Those dimensions would require only 1667 man-days to excavate, which 10 people can do in half a year.
On the other hand, the humongous 100 metre wide, 10 metre deep you now specified - well, that's 4.6 million man-days. Lagash, one of the biggest Sumerian cities, had a population of around 50 thousand. You would need to recruit one tenth of the population to do this within five years. And I am unconvinced the numbers scale well for something so many times larger than anything made at the time. If you insist on these measurements, count on this being the work of a generation.