Overview:
The ideal time duration for a history optional mock test depends on several factors, including the number of questions, the difficulty level of the questions, and the time management skills of the candidate. However, as a general guideline, a history optional mock test should be completed within 3 hours to simulate the actual UPSC exam conditions.

Factors influencing the ideal time duration:
Several factors need to be considered when determining the ideal time duration for a history optional mock test:

1. Number of questions: The number of questions in the mock test will determine how much time can be allocated to each question. If there are too many questions and limited time, candidates may feel rushed and unable to provide well-thought-out answers.

2. Difficulty level: The difficulty level of the questions can vary, and some questions may require more time to analyze and answer. If the questions are particularly challenging, candidates may need more time to come up with comprehensive responses.

3. Time management skills: Every candidate has different time management skills. Some may be able to answer questions quickly and efficiently, while others may take more time to think and write their responses. The ideal time duration should allow candidates to showcase their knowledge and analytical abilities without feeling overwhelmed or rushed.

Recommended time duration:
Considering the above factors, it is generally recommended to allocate approximately 3 hours for a history optional mock test. This duration allows candidates to have a balanced approach towards attempting the questions and ensures that they have sufficient time to answer each question adequately.

1. Reading and understanding: Candidates should allocate around 10-15 minutes to carefully read and understand the instructions and questions before attempting them. This step is crucial as it helps in comprehending the requirements of each question and formulating a clear response strategy.

2. Allocating time per question: Depending on the number of questions and the total time available, candidates should allocate an average of 8-10 minutes per question. However, this time allocation can be adjusted based on the difficulty level of the questions. Some questions may require less time, while others may require more.

3. Reviewing and revising: After attempting all the questions, candidates should reserve around 10-15 minutes to review and revise their answers. This step allows them to make any necessary corrections, ensure clarity in their responses, and improve the overall quality of their answers.

Conclusion:
In conclusion, the ideal time duration for a history optional mock test should be around 3 hours. This duration allows candidates to allocate sufficient time to read and understand the questions, answer them comprehensively, and review their answers. However, it is important to note that time management skills vary among candidates, and individual strategies should be developed based on personal strengths and weaknesses. Regular practice and assessment through mock tests are essential to improve time management skills and enhance performance in the actual UPSC exam.