[totaltec]

I don't see any limitations set on a text box. (4.5.2)

Template: /common_files/modules/Product_Options/customer_options.tpl

Line 39:

PHP Code:

{if $v.is_modifier eq 'T'}

            <input id="po{$v.classid}" type="text" name="{$poname}" value="{$v.default|escape}" /> 


So you can assign the size="40" or whatever you want it to be right there. Here is a link to all the properties that can be defined on a html input like that: http://www.echoecho.com/htmlforms05.htm

So to accomplish what you want use:

PHP Code:

<input id="po{$v.classid}" type="text" name="{$poname}" value="{$v.default|escape}" size="40" />