Answer

If you want Jain taps for 15 to 20 days, these are common and practical options:

• 15 upvas — 15 days of complete fasting
• 16 upvas — a very common and respected tap
• 18 upvas — for stronger practice
• 20 upvas — a deeper tap if your health allows
• 15 to 20 ayambil — a gentler but disciplined option
• Mixed tap — for example:

- 5 days ekasan - 5 days ayambil - 5 days upvas - and continue similarly up to 15–20 days

Explanation

In Jain Dharma, the best tap is the one that is:

• done with faith
• done with proper intention
• suitable for your health and strength
• performed with humility, not pride

If you are not ready for long complete fasting, ayambil or ekasan for 15–20 days is also a very good spiritual practice.

A simple way to choose:

• Beginner level: ekasan or ayambil
• Intermediate level: alternate upvas and ekasan
• Advanced level: continuous upvas for 15–20 days

Spiritual Understanding

Tap is not only about hunger control. In Jain Dharma, tap helps in:

• reducing attachment to the body
• increasing self-discipline
• purifying thoughts
• strengthening forgiveness and detachment
• progressing on the path of moksha

The inner bhav matters more than the outer form.

Takeaway

If you want a safe and meaningful tap for 15–20 days, ayambil, ekasan, or a mixed tap is often easier to sustain than only complete fasting. Choose the form that matches your strength, and do it with shraddha, vinay, and shuddha bhav.