This bedtime seems right, especially for the 7 month old. When my son dropped down to one nap a day at around 15 months, it moved up to 6:30. Now that he is two it is closer to 9:00 by the time we give him snacks, read, and sing. With him, he is definately procrastinating!! he has a bunch a tricks he uses when i tell him that we will be getting ready for bed soon. Along with that, he could never go to bed at 7:30 anymore like he use to. He goes to daycare and usually wakes from his nap around 4pm, so he needs to stay up a little later.
No matter what the issues, I think this is something every child does and I don't think there is a "fix" for it. I think it is very common for bedtime routines to take up to one hour. I just tell myself that I am happy once he goes down, he stays asleep!