Originally Posted by greenerpastures

these quantums are almost certainly dependent on grade. The higher your grade, the higher the number of months. Eg maybe junior level C is 1.7 months, mid level will be 2.5 months or something like that. and this differs across different schemes.

What you're asking for is essentially a table (one axis job grade, the other axis is the perf grade, then each cell is the number of months). only HR will have the full picture. But as a rule of thumb its anything between 1-4 months.