Your more than welcome to it, im not using them just now, so if you need them you can have them as long as you need.
:lol: im no expert, but thank you for the lovely compliment. I would be happy to help you though. Bonding is quite a horrid thing, especially if you have not done much of it.
I tend to follow in Kareen's speed bonding footsteps. Pop them together at the rescue, if the initial meeting goes well, take them home in the same carrier. The stress of the journey usually helps the bond. I then put them in a tiny pen (literally 4 pen panels) for a few hours, so they cant avoid each other. Once they are a bit more comfortable with each other, i make the pen larger and leave them together to get on with it. I usually leave them overnight in the pen where i can supervise.
Just depends on the bunnies though. I remember when i introduced Summer and Giles, they just fell instantly in love, so they went straight to the shed together.
I tend to find if a bond shows aggression from the start it probably wont work. My failed bondings included Taffy with a lovely boy called Echo, she just grunted and lunged at him. But when she met Riley she just took to him. Same with Holly, Gus went for her and she got upset. I put her with Frodo and, though it was not love at first sight, they were comfortable enough together. I think the first impression is the way to know if it will work.
As for how long to leave Pepper's hutch. If you dont have a different space to keep them in and intend moving Pepper and her new friend straight to the hutch, i would clean it before i left for the rescue. But ideally at least a day with everything really well cleaned.