Suggestions(2)
"a rough idea of when" is correct and usable in written English.
For example, "I have a rough idea of when I'm going to finish the project."
Exact(1)
Once you have a rough idea of when you lost it, make a list of all the places you went since you lost it.
Similar(59)
"We also have a rough idea of where the disturbance is," he said.
His address in the phone book would have given her a rough idea of where he lived.
"… we get a rough idea of where it's going to go before we get the script.
This is a laborious process, taking years just to get a rough idea of where a gene resides.
These flats usually hold 24 cans apiece, which will help you count the number of containers you have and get a rough idea of how much money you'll get when you cash in.
If you've ever seen the gait of a cow in the final stages of BSE or a sheep dying of scrapie, then you have a rough idea of how graceful Schlubman was one month ago when he was selected from his state's jury pool as a citizen-competitor for these, the most inclusive Olympics in history.
When you have a rough idea of the schools you would like to go to, then consider any sibling the catchment area and feeder schools.
The variance of SSP 1733, which has no missing spot intensities, gives us a rough idea of the degree of variability expected in spot intensities when there are no intensities missing.
They had a rough idea of the order in which they'd be killed but not when.
When choosing your plants make sure you have a rough idea of what you're picking; do not just base your choices on scent.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com