Hatchikng pekin ducklings 30 hours since first peep no zip yet?

[Fadak farm]

Hello everyone,
I had 27 pekin duck eggs in my incubator 29 days ago and out of that only 15 had movement. The yesterday on day 28 most of them had peep mark and some had movement inside but no peep mark yet so I put safety hole for them and the ones that had peep mark I opened it just by one tiny piece and applied coconut oil everyone is making chirping noise but they haven't improved since they first peeped 30 hours ago should I hatch them or open the top so they can push themselves out or wait 48 hours? I know they are alive just don't want them to die while I could have helped but didn't.
Their humidity is set between 66 to 69 and they have 1 day before they turn 30 days I put them all at one time could it be that some hatch later ?

 

[Yardmom]

Do you have a thermometer and a hydrometer not built into the incubator? If not get them before your next hatch. The delay in hatching is likely due to a slightly low temp. What type of incubator?
Ducks do take a bit to go from pip to zip. Sometimes it does take more than 24 hours. It sounds like you already made safety holes. This can slow the process a bit. Keep an eye for membranes sticking to ducklings. It can be tricky as the more the lid is off the more shrink wrapping becomes likely. If ducklings are moving and bills are clear let them do their thing.

 

[Fadak farm]

Brand is called farm innovations

 

[My15Ducks]

It took my ducklings 36-48 hours from first pip to first to hatch! I wouldn’t worry yet