Answer

In Jain Dharma, the number of Kevalis at one time is not fixed by a universal maximum.

• Minimum: 0
• Maximum: No fixed number is commonly given

Explanation

A Kevali is a soul that has attained Kevalajñāna — perfect, infinite knowledge.

So, at any given time:

• there may be no Kevali present in that era or region
• there may be one Kevali
• there may be many Kevalis simultaneously

Jain tradition clearly recognizes that besides a Tīrthankara Kevali, there can also be ordinary Kevalis who attain omniscience.

Spiritual Understanding

This shows that Kevalajñāna is not limited to one soul only. It is the highest state of purity, and any soul that destroys all karmas can attain it.

So the important point is:

• Kevalajñāna is limitless in principle
• The number of Kevalis depends on karmic conditions and the era

Takeaway

Minimum Kevalis at a time: 0 Maximum Kevalis at a time: no fixed limit stated in common Jain teaching.