I've been hands on from the start, with my GC.
I had her overnight from around six weeks old.
At around 14 months, she went through the natural clingy stage, so I went back to just babysitting.
I have her three evenings a week, minimum. If she falls asleep aftet 7 pm and wakes again, she wants her Mum.
Me having her overnight isn't essential, so we've agreed that it's not in either one of their interests.
My GC wouldn't settle for her Dad, whilst cutting her main teeth.
I'm having her overnight in November, to build up, so my DD can go away, just after my GC is two.
Do what you feel that you need to. I think four nights away, with someone who isn't in regular contact, will be very distressing for the child.