The phrase "ascertain how long" is correct and usable in written English.
You can use it when you want to determine the duration of something or find out a specific time frame.
Example: "We need to ascertain how long the project will take to complete before we can set a deadline."
Alternatives: "determine the duration" or "find out the length of time".
Wall Street has been digesting a flood of corporate numbers in recent weeks as it tries to ascertain how long the economic slowdown might last.
○ To ascertain how long they would be gone for.
Relation with family members ○ To determine whether parents are around ○ To ascertain how long they would be gone for.
It is too difficult to ascertain how long each phase will last because each recovery phase is unique, which confirms the fuzzy boundary hypothesis.
Relation with family members ○ To determine whether parents are around ○ To ascertain how long they would be gone for Age ( Deceptive Trust Development ): Some predators might lie about their age.
Future research with longer training and bigger sample sizes needs to ascertain how long lasting these effects are and who is benefitting from compassion training.
But the team acknowledge that further research, involving a larger number of people, is needed to ascertain how effective the therapy is, particularly in the long term.
Study is now being done to ascertain how that profession faced this crisis in confidence so long ago, and what lessons might be gleaned by their counterparts today.
The last point is critical to understand so as to ascertain how Britvic transforms into a business capable of sustainable long-term revenue growth as opposed to the volatile performance we have seen over the last few years.
In their experiments the researchers cooked and cooled the material to ascertain how it responded to increased temperatures, over the mid to long term, in this case defined as 90 days.
Long-term follow-up is recommended to ascertain how the mesh affects development.
