extending the quantity field display...

I know this sounds simple, but does anyone know how I change the quantity text field from displaying 4 numbers to 6? We sell editing by the word, and it can get confusing if they order 50,000 words, but only see 5000 in the text field.

You can edit the CSS:
.hikashop_product_quantity_field {
width: 25px;
}

in the front end CSS file of HikaShop via the Display tab of the configuration of HikaShop.

Thank's a lot. I really didn't have a lot of time to do this, so you bailed me out big time!