My only DC is a toddler so we're not at this stage yet, but I'm curious. A friend told me recently her 5 year old has homework every day, I think it was at least 20 min total of maths, spellings and presumably reading.
Friend also said the maths work is set on a tablet and basically requires the reflexes of an adult to do the answers fast enough for the programme to let you progress.
I'm a secondary teacher and I just find this all mad! We rarely had homework in primary but my mum read to all three of us 20 min each individually every night. I think play and time to pursue outside interests is so important. I'm assuming it's the norm nowadays but I wanted to get an idea of what was normal across the country out of curiosity.