L1A Blanket | Time for Roles& Responsibility

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Hi,
I would be attending L1 A Blanket Visa Interview at Chennai within next 10 days.
Can anyone please let me know in general how much time does the Visa Officer gives a Candidate to explain his Roles & Responsibilities if he asks that question ?

Based on this I will prepare my answer for 30 Sec or 1 min or 2-3 min.

Appreciate early response.