solana epoch-info mis-estimates epoch duration as epoch end nears

[bji]

Problem

solana epoch-info is mis-estimating the current epoch duration, and it's getting less and less accurate as the end of epoch nears. This is epoch 184 on mainnet-beta. The epoch is lasting approximately 3 days 4 hours, and the solana epoch-info command roughly showed that estimate up to a couple of hours ago, but as the end of epoch approaches, the display has been getting less and less accurate.

$ solana epoch-info

Block height: 72629917
Slot: 79918511
Epoch: 184
Transaction Count: 18232557494
Epoch Slot Range: [79488000..79920000)
Epoch Completed Percent: 99.655%
Epoch Completed Slots: 430511/432000 (1489 remaining)
Epoch Completed Time: 2days 21h 28m 46s/2days 21h 43m 12s (14m 25s remaining)

/sandbox/b-hydra-mainline/home-working/srcroot$ solana block-time 79488000
Block: 79488000
Date: 2021-05-22T03:07:36Z

$ date -u
Tue 25 May 2021 06:58:09 AM UTC

As you can see, the epoch began 3 days 3 hours 51 minutes ago. And it has approximately 14 minutes remaining. But solana epoch-info is now showing an epoch completed time of 2 days 21 hours 28 minutes, with only 14 minutes left.

Proposed Solution

[github-actions]

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