I highly, extremely highly, doubt that the original print of the film would elaborate on the amount of time that passed in the movie. The time between Littlefoot's hatching and the scene after can only be estimated.

And most of the time throughout the movie can only be speculated. I mean the events of Littlefoot meeting Cera, Littlefoot and Cera being chased by Sharptooth, Littlefoot's mom fighting Sharptooth, the earthquake, and Littlefoot's mom dying could all have happened in one day. However, you don't know. The night Littlefoot meets Cera the second time could have happened a day later, or two. It's unlikely, but possible.

Then comes the meeting with Rooter. A couple of hours may have passed between Littlefoot's mother's death and this meeting, or maybe a day could have passed.
Then comes the small pterosaurs. A day could have passed between Littlefoot's meeting with Rooter. Who knows.

Then comes the treestar in the footprint. A day or more could have passed as Littlefoot wandered the landscape, mourning for the loss of his mother. This part could have taken place in one day. Him seeing his shadow thinking it was his mother, him encountering Cera for a third time.

Then we move forward towards the introduction of Ducky. Maybe a few hours passed between the third encounter with Cera, maybe a day or two. Again, only speculations. The meeting with Petrie clearly happened within that same day. And, possibly, Cera's encounter with Sharptooth also happened on that day.
The scene with the skeleton may have happened the next day as it would have taken Cera a while to get to where the rest of the gang is. Still more speculations.
Spike's introduction happens right after Cera tells them about Sharptooth. Those two events happen in the same day.

The scene where they are all walking along the river must have been the same day as the previous two events as Ducky is holding the berries used to entice Spike away from his nest. The scene with the finding of the small grove of trees could be the same day also. As could the scene where they find green food.

From there, it's clear that the day progress to night and on to the next day, where the gang meets sharptooth again. When the gang are traveling up the mountains must be a couple hours or so after the meeting with the sharptooth that morning. Then there's Cera and Littlefoot's fight, followed by the volcano scene and continuing on to the fight against Sharptooth. Then, finally, the finding of the Great Valley. All these scenes mentioned in this paragraph all make up one day as night is not shown and there is enough time in the day for it all to happen, albeit spread out.

The gang's adventure could very well have taken a week or more. It's still all just speculation.

The time between Littlefoot's hatching and the scene after can only be estimated.

And how much time do you estimate?

Thanks, a few months seems a much more likely amount of time to account for how long Bron was away.

Yes, a whole day. Littlefoot meets Cera at dawn, and it is dawn all the way to the earthquake's end. Then the movie goes fast forward to night. The sky is yellow because the air is full of particles from volcanic activity and the dust raised by the wind from the dry land. Tiny particles absorb blue and green light, so the sky colour would always variate between red and yellow

So a whole day did pass? Or were you being sarcastic and the afterwards was an explanation. If so, does that explain why the sky also turns red and yellow in the sequels?

"The time between Littlefoot's hatching and the scene after can only be estimated."

Bron was gone this whole time, so unless he went really far it couldn't have been long, could it?

How do can figure Bron into the events of the original? Nobody had Bron in mind back then.

This might be an insignificant point, but you could also take into consideration that (at least as far as I know) no one really knows how young dinosaurs age. =)
In the first post it was mentioned that Cera looked bigger next to her dad at the end of the movie, so she might have grown since then. Maybe it's safe to assume that different species of dinosaur age at different rates, just like today's animals do.
If Ducky didn't look different in size from her siblings, maybe they just age differently? There's a lot to speculate. =)