Excuse me, does their practice of restricting personal freedom comply with relevant laws and regulations?
Yes, the provisions of the Criminal Procedure Law on measures such as investigation and detention.
How long will it take mom to go home?
It's hard to say, only the case handlers know.
What efforts should be made at home?
Wait a minute. /kloc-if you don't come back in 0/2 hours, you are suspected of committing a crime. No relatives who have no access to the law, find a lawyer.
Do you need a lawyer at this time?
Yes, you can legally hire a lawyer as long as you are interrogated for the first time.