Signs of hatching within about a week would be denting (don't increase humidity) and then maybe a couple days out, a sort of cucumber smell. You'll know it when you smell it. But those things don't always happen. I start checking once a day at about 55 days, and then twice a day at 60 or so. I try to restrain myself to twice a day.
Once you see the first slit- it's so amazing! It's like it's not really real till you see that first little nose. But then it can take a baby 24 hours to emerge! And constant checking only makes it take longer. I remove the moss covering when the first egg slits (and leave a couple little piles in the corner of the egg box, to give the hatchlings somewhere to gather so they aren't out plowing through the other slit eggs). Then I _try_ to restrict myself to checking/removing hatchlings to three times a day- before work, after work, before bed. It can take a couple three days for them all to emerge.
At 60 days- you're just at the beginning of the wait!! _Probably_ you'll have hatchlings by 70 days. But if you don't- don't freak out and start cutting eggs. Just be patient.