ZURICH, Dec 9 (Reuters) - Credit Suisse (CSGN.S) plans a sixth payout in December to investors in frozen supply chain finance funds linked to Greensill, the Swiss bank said on Thursday, adding it had recovered around $7.1 billion by the end of November. In March, Credit Suisse had to suspend $10 billion in funds linked to Greensill and has been paying back the money it recoups in stages. In an update published on Thursday, it said it was accruing around $145 million in estimated recovery costs for the year 2021.