I started the bonding off of midnight and alby of for Joy their owner, they had been introduced on non neutral territory and nearly killed each other. I had them over with me to start with and they were snuggled up to each other and very trust worthy within 4 or 5 days. These were both adult buns.
The one thing I would suggest is to tdo your home work on ensuring that territory is neutral. It is worth it in the long run as it saves the hastle.
I also started Romy off who has Darcy, with 2 single girls Oreo (now Beatrix) and Annie, Romy is doing a good job with them at the moment, they have been together for a week now, whilst they are having the odd squable for most of the time they are fairly chilled out. Darcy is 3, Oreo is 1 and Annie was 1 year old.