Sleep and wake times?

Ca

My 5 month old goes to bed around 7 and wakes up at 7 - with one feeding around 3-4. For the past few weeks he wakes up around 6-630am. Sometimes I can sneak in and give him his pacifier and turn on the white noise and he'll go back down but sometimes only for a little bit. Sometimes if we ignore his noises (Hes usually babbling in his crib) he'll put himself down, but again maybe for 10 min. I don't want to get him up before 7 ...we tried moving his bedtime to around 715pm..

My question is - what time does your baby go to bed and wake up? How much sleep so they get at night? Websites suggest between 10-12 hours..