CC&R Amendment - How long is OK (and how many mailings) to get something passed

There is an Amendment to our CC&R's "up for vote" to change the way the assessments are done without enough percentage to pass it for quite some time now.

HOW long is a reasonable time to wait for votes to come in before the secretary declares the amendment not passible?

Is the board allowed to put out multiple mailings (over time) until enough votes trickle in to pass the amendment?

The assessment increase and change seems reasonable to me and the money is needed by the POA.
Present system: per acre Assessment, per acre vote in association
Amendment: Per Parcel Assessment, per acre vote in association
This is a remedy to provide relief for extra use of common areas (roads/wells) for parcels that subdivide (by up to 8 times) and have up to 8 owners vs. a single owner of a not-subdivided parcel.

However, I don't want someone to challenge this in the future and have the POA be tied up in expensive litigation because someone is disgruntled and says it was an illegal vote because of the time it took to pass.

How long is too long? Anyone have any experience with this? It's a first for me.....

Thanks!

Irma, it depends on your controlling documents. If the term is not specifically stated and there is no controlling state document then I presume the Board will make that decision. I know of one HOA that worked on amending their CC&Rs on roofing materials for over 3 years.