Very curious

Does anyone else's husbands call there mom 20+ times a day... I love my husband's mom and family so this isn't a I hate his mom post lol but its starting to get in the way of him spending time with me. He works from 11:40 am to 9 pm he calls her all throughout the day and she has a job and most of the time she can't answer but my husband doesn't care he keeps calling anyways which aggravates her but he doesn't listen when she tells him not to call her at work and then when he gets off at 9 I like to set and talk with him and try to have a conversation or watch TV for an hour before we go to bed so we can spend some time together but instead and he calls his mom multiple times she will answer, they'll talk, get off the phone and then 20 mins later he is calling her again... I wish I exaggerating about how many times he calls her but I'm not most of the time he calls her because he wants something but I feel bad for her most of the time because I know her phone constantly rings when she is working she isn't allowed to answer her phone at work but he calls so much that she does to tell him she can't talk and she can't ever get a break and he does it so much we can't even talk to each other about our days or spend time witg each other i love him but its starting to be a buzz kill like leave the poor woman alone I'm sure she would appreciate it and I would as well lmao. But I really want to know if anyone else's husbands do this too and what can I do to try to make him leave her alone so she can work and call her at normal times and not all day long so we can spend time together when he gets off but he can also have time to call his mom before he goes to work or on her lunch break. I've talked to him before but he always acts like he doesn't really care and no I'm not leaving my husband because he calls his mom I just want advice on how I could talk to him in a way that he will actually listen.