How often should a child see their grandparents?

How often do your kids see their grandparents? My mom complains she doesn’t ever see my daughter to people. We see her once a week and typically spend at least 4 hours there. We live 45 minutes away so it’s hard with a infant (4 months). I’ve invited her over because she’s a stay at home wife to my dad who works in the town I live in. But she always complains about the distance or says she doesn’t have time. She also gets upset my husband (who doesn’t like her) stays in our room with the door shut when she’s over. Opinions? My husbands parents have never met our daughter (religious issue theirs not ours. I’m Christian so that’s against their beliefs) so my parents are her only grandparents