The phrase "estimate on when" is correct and usable in written English.
For example, you could write: "Can you please provide an estimate on when the project will be finished?".
No estimate on when the subway lines might run again.
Mr. Clendenin said there was no estimate on when power would be restored.
There was no estimate on when those materials might be made public.
The current default target date, 17 October, is merely the Treasury's best estimate on when it would run out of money.
The cause of the shutdown was not known, and there was no estimate on when the system would be repaired, Mr. Fleming said.
The extradition was ordered by Prime Minister Lionel Jospin, said Ms. Abraham, who had no estimate on when American authorities hoped to regain custody of Mr. Einhorn, now 60.
She has stopped giving estimates on when the bar would open again, but said the support that had poured in had taken some of the sting out of the daunting, seemingly endless hurdles that lay ahead.
Moreover, comparing their findings with old data on how much water the basins can store, the researchers found widely varying estimates on when basins would run 90% dry from 10 years to tens of thousands of years, in the case of the northwest Sahara.
With the storm still active, the company said it can offer no estimates on when restoration efforts will commence in full or how long those efforts will take.
CMS spokeswoman Joanne Peters said on Friday and on Saturday that representatives of the agency were unavailable to comment on the contract or on an estimate of when the financial management part of the marketplace is expected to be finished.
Data are then reported from two separate studies which converge on the same estimate of when language can effect, via the oculomotor system, discrimination between alternative targets.
