I try to hit the post office no more than twice a week (preferably Tuesday and Friday). By the way, are the days calculated as calendar or business days? If I have an order that runs out past a week, that becomes a serious problem for me, but as others have stated, life happens. As a one man shop, nobody else can do my orders if I end up in the hospital or have to travel for work (yep, I do have a day job too!). I’m curious how it will be perceived by the customer if they have a 7 day shipping commitment that gets stretched to two weeks if I end up going “on vacation mode” while I have open orders? I can see this becoming a customer service issue as the commitment is essentially broken or extended without the customer’s permission.
Perhaps go ahead and have a reasonable commitment, but go with a tiered resolution? Lets take the case of two weeks to ship before refund. After the first week, an automated double-blind message is sent to both the customer and the seller indicating something to the effect that Tindie is checking the status of your order. Both replies feed into customer service so that you can get feedback from the seller about why it is taking so long. If the customer replies, you have a chance of having something to tell them if the seller also replied.
The metrics can be adjusted as needed (maybe 20 days with a check-up half way). Hopefully the load to customer service is only those trouble orders that need the little extra attention. The mid-way check-up may end up being reminder to a seller who forgot about the order, but still has time to react before refund.