Learn Dutch: Ik schat dat we de kast in een minuut of tien demonteren. - I estimate that we will disassemble the cabinet in about ten minutes.

This is a common Dutch structure for estimates. You use een followed by a singular unit (like minuut), the word of, and then the number. Because of the initial een, the unit stays singular even though the number is ten. It literally translates to 'a minute or ten' and sounds very natural in everyday speech.

Why is the verb demonteren placed at the very end of the sentence?

The word dat (that) introduces a subordinate clause (dat we de kast in een minuut of tien demonteren). In Dutch subordinate clauses, the conjugated verb is pushed to the very end. That is why demonteren comes after the object (de kast) and the time phrase (in een minuut of tien).

The English translation uses 'will disassemble', but isn't demonteren in the present tense?

Yes, it is present tense. Dutch frequently uses the simple present tense to talk about future events, especially when the context makes the timeframe clear. The phrase ik schat dat (I estimate that) already implies you are predicting a future outcome, so the future helper verb zullen (will) isn't necessary.

Can I just say in ongeveer tien minuten instead of using the of tien structure?