I think Conservancy needs to outright reject travel reimbursement
requests after 90 days.

The "Board of Directors approval for 90 days late" rule was originally
instituted to make it clear that reimbursements beyond 90 days were
really difficult for Conservancy to process.

In practice, the rule has meant that travelers simply believe that they
"have another out" if they are late, and late reimbursement requests put
an undue burden on Conservancy staff for special processing, and they
create extra work for our volunteer Board of Directors.

As such, Conservancy should simply rejects reimbursement requests that
are received 90 days or more after the last day of travel.