Frequency of seeing family is as long as a piece of string, but I see warning signs when the OP says Mine live 10 mins away and expect once a week but I’ve been able to push it to twice a month. and uses 'Diktat' as a nickname.
Most parents and grandparents have the kind of relationship where words like 'expect' do not arise, they just fall into a happy arrangement. Some grandparents are providing childcare and see the children daily. and with others it is less regular.
I have no experience of close grandparenting, but DDiL's mother lives close and in the early years she was in and out all the time and DDiL and DS owe her an enormous debt of gratitude for the help she gave them.
Now the eldest DGC is in secondary school, she sees them less, but still rings and drops in regularly, in the same way they ring and drop in on her. As paddyann says, Thats how families are surely ,they spend time together because they love each other