In Jainism, a samayik is a period of deep inner reflection and self-discipline aimed at purifying conduct and thoughts. It helps to stop new karmas from binding and to shed existing karmas, but there is no fixed or measurable amount of karma that a single samayik sheds. The actual amount of karma shed depends on the sincerity, restraint, repentance, and mental focus of the practitioner, and on how closely one follows right conduct during the practice. Different Jain traditions (Digambar and Shwetambar) may describe the practice slightly differently, but both agree that samayik aids in reducing karmic bondage over time, not by a specified quota in one sitting.

If you’d like, I can point you to more detailed explanations from Jain sources.