congratulations on your match, as others have said it varies widely based on all sorts of factors. however, as a heads up, based on my own experience, i'd brace yourself for perhaps a tricky few weeks at first, followed by hopefully a little more calm once youve establisged routines.
my son was 13ms when he came home and i think i underestimated at the time of intros how much work settling him in was going to be as he came across as a very "easy", adaptable baby in intros. of course, knowing what i know now about trauma and grief, I would go in with different expectations despite how they present in intros (its worth rmeembering in many ppls experience the way you experience your child in intros will differ to the reality and very different context of being at home)
Truthfully I think my experience was on the milder end of the scale and ultimately he did settle fairly quickly but i wouild say we had a period of about 3-4 weeks where it was fairly obvious despite his young age that he was greving his FCs. he was very hard to settle at night because he wasnt capable of self soothing (foster carers had done a combo of special blankie, rocking him to sleep in arms, certain TV before bed etc) - we did make changes very gradualy over time but in the intiial instance the focus was really on ensuring that everything he was comfortable with and used to was replicated as much as possible, however inconvenient or tiring for us!
definitely echo comments about photos. keep on with photos of any family including yourselves and lots of reinforcement of who ppl are. definitely agree with keeping everything the same - routines are so important in the initial stages, so however much it may clash with your own views of how youd ideally liek to do things i cant emphasise enough how important it is to keep to the things they know, down to things like clothes they know from foster carers, smellies, blankies, even feeding equipment. lots of holding and eye contact wherever possible. what really helped us was a tip to make sure the buggy is always parent facing so they can get used ot your face and feel reassurance. remember theyre in a new environment so anything you can do to make their new room more like their older one before you make any big changes. youll have read about cocooning i expect, the process of only gradual introductions to family ,and that really helped us, especially making sure you guys are the only ones to do care taking tasks in the early days. finally, on same vein, what really helped altho felt a little un natural at firsr i'll admit, is ensuring that any holding or physical affection comes fro myou (and/or your partner) for the first couple of months or so. so as not to confuse them and to help them build the understanding of you as thier main caregivers. had a few awkward moments where ppl assume the ycould swoop in and hold him but worth those awk moments in the long term i promise. good luck xxx