Faction Limit?

Is there a limit on how much Faction you can earn per day?

I believe in the Zaishen Challenges there MAY be a faction limit.

you can earn as much as faction as you can, though you can only gain 1k faction from the zaishen challenges per day
you have a maximum of 10k faction unspent

Eh earn 10 k Faction spend it, rinse and repeat? Per day you mean it's unlimited until you stop PVPing and spending faction.