The fields are formulated via a function based on the length or based on the setting in the:
/includes/templates/template_default/templates/tpl_module_create_account.php
PHP Code:
<legend><?php echo TABLE_HEADING_LOGIN_DETAILS; ?></legend>
<label class="inputLabel" for="email-address"><?php echo ENTRY_EMAIL_ADDRESS; ?></label>
<?php echo zen_draw_input_field('email_address', '', zen_set_field_length(TABLE_CUSTOMERS, 'customers_email_address', '40') . ' id="email-address"') . (zen_not_null(ENTRY_EMAIL_ADDRESS_TEXT) ? '<span class="alert">' . ENTRY_EMAIL_ADDRESS_TEXT . '</span>': ''); ?>
<br class="clearBoth" />
PHP Code:
<label class="inputLabel" for="password-new"><?php echo ENTRY_PASSWORD; ?></label>
<?php echo zen_draw_password_field('password', '', zen_set_field_length(TABLE_CUSTOMERS, 'customers_password', '20') . ' id="password-new"') . (zen_not_null(ENTRY_PASSWORD_TEXT) ? '<span class="alert">' . ENTRY_PASSWORD_TEXT . '</span>': ''); ?>
<br class="clearBoth" />
<label class="inputLabel" for="password-confirm"><?php echo ENTRY_PASSWORD_CONFIRMATION; ?></label>
<?php echo zen_draw_password_field('confirmation', '', zen_set_field_length(TABLE_CUSTOMERS, 'customers_password', '20') . ' id="password-confirm"') . (zen_not_null(ENTRY_PASSWORD_CONFIRMATION_TEXT) ? '<span class="alert">' . ENTRY_PASSWORD_CONFIRMATION_TEXT . '</span>': ''); ?>
<br class="clearBoth" />
You can customize your template by copying that to:
/includes/templates/your_template_dir/templates
and chaning the length ...
Now for me, I have never made a password as long as my email address ... but this is up to you ...