The phrase "hefty duty" is correct and can be used in written English.
It is typically used to describe a task or responsibility that is difficult or demanding. Example: "I was assigned the hefty duty of leading the project team to meet the tight deadline."
Lyons proved himself up to the delicate task before him, interceding at crucial times, as when Lincoln blockaded major ports in the south or when the northern legislature attached a hefty duty to imported products – the bulk of which came from Britain.
Then, of course, there would be the Chinese retaliation against a hefty duty on their goods.
The long-sleeves and knee-length hem of the Alexander McQueen sheath perfectly offset the risqué neckline (even though we're sure there was some hefty duty double-stick tape involved).
In Belgium it led to hefty duties on genever, a gin-like drink consumed by the Dutch, hitting its popularity.
The Bush administration sought the decision from the panel, the International Trade Commission, last summer and now is widely expected to impose hefty duties or quotas on foreign-made steel early next year.
The Scotch whisky industry has applauded a decision by George Osborne to agree to a "historic" cut in duty for whisky, after he trimmed 2% off the hefty duties paid on each bottle.
[C3.] U.S. Says It Will Accept Nafta Decision on Lumber The Commerce Department said that it would accept a Nafta panel ruling in a long-running dispute with Canada and would substantially reduce hefty duties on Canadian softwood lumber.
A federal trade panel recommended hefty duties on steel imports today, clearing the way for President Bush to protect troubled domestic steel companies but almost certainly raising the price of cars, appliances and other steel products.
Kazakhstan is also a recent member of a customs union - along with Russia and Belarus - which has made it far more expensive for neighbouring countries to import alcohol without paying hefty duties.
As with all illicit dealers (he transhipped the cigars through Estonia and smuggled them from there into England, thus avoiding the hefty customs duty), I felt under an obligation to smoke enough to justify his risks.
First-time buyers Jeremy Gray and Aisling Ward, both 24, think property prices are steep enough without having to pay a hefty stamp duty bill on top, so they will be disappointed by the chancellor's decision to leave thresholds at their current levels.
