When Should I Give Up on Incubation?

[astronomer]

I am incubating a few eggs laid several days apart. The earliest one is coming up on 30 days in the incubator. When should I give up and toss out the egg? It showed progress up until day 25 when I checked it last, now I can't see anything by candling. It's taking up too much of the egg. We've been on hatch watch for a while. Not sure what type it is, we have buff, peking, rouen, and black swedish ducks.

This is my incubator: http://www.amazon.com/gp/product/B00KD75VHW?psc=1&redirect=true&ref_=oh_aui_detailpage_o01_s00

 

[silkiecuddles]

If it isn't moving, or it smells bad, I'd toss it. All mine hatched in my Brinsea by day 28 (Pekins). How many eggs do you have in there?

 

[astronomer]

It doesn't smell, but i don't see it moving, and the air sack isn't any bigger. I have 4 eggs total. 1 laid may 30th, 2 laid June 9, and 1 laid June 19th.

 

[silkiecuddles]

So they were all set on different dates?

 

[astronomer]

Yes

 

[caesargirl]

What is your temp and humidity?

 

[astronomer]

37.2C (which is 99F)
I don't have a humidity sensor in there. I suppose I should get one. The directions just say to put 100ml of water in the base every 2 days.

 

[caesargirl]

You MUST measure humidity. And you're running half a degree low. That could account for a slightly longer hatch. You don't have any condensation do you?

 

[astronomer]

No condensation. I double checked the temp. It's 37.4C or 99.32F.

 

[caesargirl]

Well, give it a bit more time in my opinion. Als check out "the duck thread". Lots of chatter over there with many experts....quicker answers for you!