• Tap (tapas) is a discipline of self-control, ascetic practice, and purification. In Jainism, intense and right-minded tapas helps burn and shed karmic impurities.
• There is no fixed amount of paap that gets "removed" or a precise number of years shaved off Naraki (hell) life. The scriptures teach that tapas reduces bondage in general, by reducing the specific karmas that cause suffering in future births.
• The result depends on factors such as:

- sincerity and intention (samyak bhavna) - the type and extent of austerity practiced (e.g., fasting, standing or sitting austerities, voluntary discomfort) - adherence to righteous conduct (non-violence, truth, non-stealing, celibacy, etc.) - consistency over time

• In both Digambar and Shwetambar traditions, the uplifting effect of tapas is affirmed, but the emphasis and descriptions may vary in detail between the two traditions. The core idea remains: disciplined tapas leads to a reduction of karmic bondage and thus a decrease in future suffering.
• If you want, I can point you to specific Jain texts or stotras that discuss tapas and karma in more detail.

Note: I’m keeping the explanation focused on Jain Dharma. If you’d like exact verses or a traditional interpretation from Digambar vs. Shwetambar sources, tell me and I can present the precise wording and meaning.