Mine were quick, don't know if it counts as love at first sight though....
I took Harvey to Lilly's previous house (she was a "free to a good home" gumtree bunny). Put them in a neutral space together. Harvey completely 100% blanked Lilly, she followed behind sniffing him. He was so unthreatened that he was washing and then laid down with her next to him :lol: so it was decided Lilly would come home with me (had to wait a week or two whilst I ordered a spare hutch).
I did bonding myself in the bathroom, using the dating method, the first two days there was a lot of humping from Harvey to Lilly, but they also were happily flopping together and snuggling, there was grooming from Lilly to Harvey too. By the third no humping and Harvey had started to groom Lilly back
so I left them together from then onwards
I also swapped their hutches every day too!
I think that that was pretty close to love at first sight! Well I count it in my mind because there was no aggression and I think Harvey showed he loved her from first sight by having no reaction whatsoever at first meeting
First meeting at Lilly's old house:
Second bathroom date at my house:
(She's actually cuddling him with her front paw in that last one!)