DD1 was 10 weeks, outgrew moses basket and she had a huge sleigh type cot that we couldn't fit in our room. She slept right through the night from the moment we moved her.
DD2 was 7 weeks and was even longer, she was a very light, noisy sleeper. My husband starts work at 5am and would wake her getting up and going in shower in en-suite. She didn't like her cot to begin with, added white air wrap bumpers so it looked more like her Moses basket and she settled great.
I used a monitor with a movement pad for some peace of mind, if they stop breathing the alarm goes off. I used to check on DD1 all the time in the beginning because she was such a sound sleeper, never made a sound and would sleep from 7pm till 9am, no noise ever woke her lol. DD2 is so noisy, she grunts and moans all night so i always know shes ok, she still keeps me awake some nights and shes in a different room! Sometimes it sounds like shes awake but when i go through to keep she has her eyes shut, just makes noises in her sleep. She sleeps 6pm till 8am now