How long does it take to monitor one person
User photo

Richard67

Inquirer

Hi, I’m considering surveillance on someone and would like to know how long such an operation usually takes. Is this something that can be done in a single day, or does it require multiple days to get reliable results?

Answer from 

Peter Hoffman, B.Sc.

Surveillance Specialist

Thank you for your question. The duration of a surveillance operation depends on several variables, including the objectives of the investigation, the subject’s behavior patterns, and the level of evidence required. Below is an overview of the key factors influencing the timeframe.

What Determines Surveillance Duration

  • Case Objectives
    If the goal is to verify a single event (e.g., meeting a specific person or attending a location), a few hours of surveillance may be sufficient. For comprehensive behavioral analysis or proof of ongoing activities, multiple sessions across different days are often necessary.

  • Subject’s Routine and Predictability
    A subject with a consistent schedule is generally easier to monitor efficiently. If the subject has irregular habits, travels frequently, or takes counter-surveillance measures, additional time is required to gather actionable intelligence.

  • Type of Evidence Required

    • Basic Confirmation: 1–2 surveillance sessions (4–6 hours each) may suffice.

    • Court-Admissible Evidence: Typically requires several days of observation to demonstrate a pattern of behavior and ensure evidence integrity.

Industry Best Practices

Professional surveillance usually involves:

  • At least two investigators for optimal coverage and reduced detection risk,

  • Advanced equipment such as long-range cameras, GPS trackers (where legally permitted), and secure communication systems,

  • Operational planning to anticipate movement patterns and avoid blind spots.

Typical Timeframe

  • Short-term assignments: 1–2 days, focusing on a specific event or timeframe.

  • Comprehensive investigations: 3–7 days (or more), to document recurring behaviors and establish evidence suitable for legal proceedings.

In cases involving infidelity, fraud, or corporate misconduct, extended monitoring may be recommended to capture multiple instances of the suspected activity.

Why Multiple Days Matter

Surveillance often requires patience and adaptability. A single day may not capture the behavior in question, leading to incomplete or inconclusive results. Multiple observation windows significantly increase the chances of obtaining clear, verifiable evidence.

Next Steps

We recommend an initial consultation to define your objectives and develop an investigative plan tailored to your needs. This helps estimate the number of hours or days required, as well as the resources involved.

Contact us today to discuss your case in confidence.

Is this answer helpful ?

Ask a Private investigator

By submitting this form, you agree to the processing of your personal data in accordance with our Privacy Policy.

We are accepting new cases

Trust our Private Investigators to Uncover the Truth

Custom Footer
DET.GROUP (also known as DETGROUP)

© 2025 DET.GROUP® (also known as DETGROUP) – Europe’s modern Private investigation agency