Hi @Coldfeets congratulations on your match.
I work away leaving my son with his dad. Mine is a couple of nights every few weeks but not a set pattern.
Additonal to all said above, before going I talk about going away and what I will be doing for work.
We stick to routines as if I was there, I always do a morning and evening video call so he can see where I am and block our my diary to do so. The first few times I brought gifts back but he now has everything he would like. So have turned to making videos of me getting trains, trams and buses so he can see how they differ to our local transportation and send them to Dad for them to talk about during my absence. We then watch them on a loop the days after I am back.
I constantly tell him how much I love him, missed him when away and am glad to be back with him. It is getting easier each time and as he grows his understanding is also improving.
We did notice his behaviour at nursery dipped the 2nd day I was away so started telling staff and they would talk about where Mommy has gone and how I get there plus do extra nurturing throughout the days.
Not been such a problem at school, he started reception in September, so only a 3-4 month gap since transitioning plus he has had a birthday too.
Good luck, it will be hard and easy. I think of it as a positive benefit for us all when I start mithering.