Because I'm lame and have nothing better to do, I have calculated the window of victory for each remaining contender's guess to be the closest to the final time!
NOW to 51h 35m - @esther43 (backed by @marynnu )
51h 35m to 64h @Jw192 (backed by @Sarahlou )
64h to 72h 30m - @bobbymkii (backed by @Dotta )
72h 30m to 77h 30m - @CS2C (backed by @Kittybunny )
any time longer than 77h 30m - @V347 (backed by @crystalline )
NOW to 51h 35m - @esther43 (backed by @marynnu )
51h 35m to 64h @Jw192 (backed by @Sarahlou )
64h to 72h 30m - @bobbymkii (backed by @Dotta )
72h 30m to 77h 30m - @CS2C (backed by @Kittybunny )
any time longer than 77h 30m - @V347 (backed by @crystalline )