When does Magento consider a cart to be abandoned? Where's that time limit set?

Question

If left to default settings, what circumstances would have to occur for Magento 1.7 to consider a cart abandoned? Where is the code that makes this determination located?

Answer 1

In our e-commerce we've overridden the method cleanExpiredQuotes inside app/code/core/Mage/Sales/Model/Observer.php

Our business rule looks like this:

$quotes = Mage::getModel('sales/quote')->getCollection();     
$quotes->addFieldToFilter('created_at', array('to'=>date("Y-m-d", time()-$lifetime)));

$quotes->addFieldToFilter('is_active', 1);
foreach ($this->getExpireQuotesAdditionalFilterFields() as $field => $condition) {
    $quotes->addFieldToFilter($field, $condition);
}
$quotes->walk('delete');