Yes, there is no time limit for sending back the box. We do get quite busy at the end of the school year and around the holidays since those are the most popular times for parents to return their boxes. Processing time will be longer during those periods, so if you want your keepsake with a faster turn-around, send it during off peak windows (January-April and early fall). We also do raise prices occasionally so this will impact your second payment. Sending your art back sooner guarantees the best pricing.