The phrase "a time when several" is correct and usable in written English.
It can be used to refer to a specific period in which multiple events or actions occurred simultaneously or in succession.
Example: "There was a time when several countries came together to address climate change."
Alternatives: "a period during which multiple" or "an era when various".
His plea comes at a time when several sites are under threat.
The ruling comes at a time when several state governments have moved in the opposite direction.
It could also lead to less demand for bond insurance at a time when several big guarantors are faltering.
The operation also displayed Western unity at a time when several cracks have emerged in the transatlantic alliance.
The move comes at a time when several other African nations, including Algeria, Egypt, Morocco, Namibia and Nigeria, are considering nuclear power as an alternative to hydropower.
These digital wellbeing initiatives come at a time when several prominent technology execs have expressed regret over their role in building addictive products.
Our results show that the algorithm scales with the number of processors and offers a reduction in computation time when several phenotypes are analyzed simultaneously.
Not that it's not successful and doesn't work a lot of times when several people are involved, but I think, in general, the best art is created by one person, and you don't need a focus group to tell you whether it's good or bad.
But their claim to them came at a time when Italy, Greece and several other countries had begun to wage impassioned public campaigns for repatriation of objects viewed as cultural patrimony that led to the return of pieces by the Metropolitan Museum of Art; the Museum of Fine Arts, Boston; and the J. Paul Getty Museum.
AOL's suit against the spammers comes at a time when there are several anti-spam bills in Congress.
(Back in 2016 carriers were merely talking about building "a path" to one billion users — at a time when SMS had several billions of users, suggesting they saw little chance of creating anything near next-gen messaging ubiquity via the standard).
