I would like to ask what is the difference between this idiomatic expression and "tengo ganas de"/"estoy deseando" ...? Thank you

Hola Emanuel,

They are all synonyms that express "looking forward to something", but "no ver la hora de algo" is slightly more emphatic than the others, I'd say. It adds a bit more intensity to the desire. With this one it is as if someone has been waiting for a long time for something to happen.

I hope this helps.

Saludos

Inma