how long have the clients there
Answer (1)
This sentence is incomplete. A corrected version might be: “How long have the clients been there?”The time clients have been at a place depends on when they arrived and the current time. For example, if they arrived at 2:00 PM and it is now 4:00 PM, they have been there for 2 hours. To answer questions like this correctly, you need both start and end times.
