Answer

In Samavasaran Tap, traditionally there are 20 Ekasana.

Explanation

Ekasana means taking food only once in the day, while observing proper Jain discipline and restraint.

Samavasaran Tap is connected with the divine Samavasaran of a Tirthankar, where all living beings can receive the Tirthankar’s Deshna.

Takeaway

So, Samavasaran Tap = 20 Ekasana.