Approximately how many seconds into the flight are the Soyuz strap-on boosters designed to separate from the core stage?

Answer

Around 118 seconds into the flight

The physical architecture of the Soyuz rocket, which employs four strap-on boosters firing concurrently with the central core stage engine at liftoff, requires a precise sequence for stage separation. The design mandates that these four boosters must detach from the core stage at a specific point in the ascent trajectory. This critical separation event is scheduled to occur when the vehicle is approximately 118 seconds into the flight, ensuring that the remaining core stage engine can continue propelling the vehicle toward orbit efficiently.

Approximately how many seconds into the flight are the Soyuz strap-on boosters designed to separate from the core stage?
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