On mobile but didn't you leave off the percentage sign? (which is another two zeros after the dot)
Of course this is taking op very literally
EDIT: I checked: google "0.001% * 1 year" and it tells you 5.259 minutes, so you were off due to dropping the % sign. That changes things dramatically: beyond the 100x difference, there is very high likelihood that someone would check back 2 minutes later (especially if they are waiting all year), so 5 minutes of downtime (spread over a whole day) likely objectively results in much lower lost sales than your calculation implied! For future envelope calculations don't forget that a % sign is exactly moving the decimal two more places! 55.2% is exactly .552 and so forth!
Of course this is taking op very literally
EDIT: I checked: google "0.001% * 1 year" and it tells you 5.259 minutes, so you were off due to dropping the % sign. That changes things dramatically: beyond the 100x difference, there is very high likelihood that someone would check back 2 minutes later (especially if they are waiting all year), so 5 minutes of downtime (spread over a whole day) likely objectively results in much lower lost sales than your calculation implied! For future envelope calculations don't forget that a % sign is exactly moving the decimal two more places! 55.2% is exactly .552 and so forth!