ETA constantly shows <1min remaining during a 1+ hour process

[howardjones]

I know from Windows 95 not to put too much faith in ETAs, but this is consistently and obviously wrong! progress 1.4 will show an ETA of at most a few minutes, even when it is 50% of the way through a large hour-long process. Is there some timing module that it needs to work more reliably?

I am using it with requests and humanize to show a progress bar for HTTP PUT requests of large files:

class HumanBar(ChargingBar):
    @property
    def eta_human(self):
        return humanize.naturaldelta(self.eta)

    @property
    def max_human(self):
        return humanize.naturalsize(self.max, binary=True)


class MonitoredFile(object):
    def __init__(self, handle, size=0, callback=None):
        self.len = size
        self.handle = handle
        self.callback = callback
        self.total = 0
        self.bar = HumanBar('Uploading %(max_human)s: ', max=size, fill='>', suffix='%(percent)d%% ETA %(eta_human)s  ')

    def __len__(self):
        return self.len

    def read(self, *args):
        chunk = self.handle.read(*args)
        if len(chunk) > 0:
            self.total += len(chunk)
            self.bar.next(len(chunk))

            if self.callback:
                self.callback(len(chunk), self.total, self.len)
        return chunk

The percentage is accurate, but the ETA isn't even close...