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Ta.

Just wanted to be sure that I was understanding Chaika's comment correctly.

Right, so to which sentence is "За какой срок можно научить ребенка кататься на коньках?" closer in meaning?

You can't simply substitute 'does' for 'could' in that sentence, as Chaika said. If you want to use "could", you'd have to change the structure of the sentence to something like

"How quickly could...