Some of that depends on the Post Office. I mail your package no later than the next morning after payment is received. Some packages go out the same day depending on the time that payment is received. Most packages are delivered in 2-4 days after they are mailed. International packages take a little longer.
I have been selling online for about 5 years now.
Yes, returns accepted after delivery of your item.
Please email me. Leaving me a negative feedback does not really tell me who you are so I can solve your problem. I would be glad to fix or replace the unit if I can. Worse case, I can only give you a full refund.