Yes. 1 to 2 month
The have lot of BV check, One at Wipro level , one at project level.
Even though they would have completed the BV check they might do after 2 to 3 years after joining.
Background check is done.
Yes, and its very thorough
It needs a background verification and min of 2 months.
Yes they do a complete background check , takes few months to do the same
Yes. Nsr registration is required and bvg is done
Yes, a very strong BVG done by third party