Stuck on chemistry

Question

How long it would take for the [ ] of CV to reach 4.0x10^-6 if the starting [ ] was 1.0x10^-5 and [OH] was .040 M

Answer 1

Need more information that what is provided. There must be other experimental data that was collected, such as the rate of reaction, or the rate constant, etc. Such information is needed to answer this.