```xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ns4:query_definition xmlns:ns2="http://www.i2b2.org/xsd/cell/crc/psm/1.1/" xmlns:ns4="http://www.i2b2.org/xsd/cell/crc/psm/querydefinition/1.1/" xmlns:ns3="http://www.i2b2.org/xsd/cell/crc/psm/analysisdefinition/1.1/">
    <query_name>Length of stay@11:19:08</query_name>
    <query_timing>ANY</query_timing>
    <specificity_scale>0</specificity_scale>
    <panel>
        <panel_number>1</panel_number>
        <panel_timing>ANY</panel_timing>
        <panel_accuracy_scale>100</panel_accuracy_scale>
        <invert>0</invert>
        <total_item_occurrences>1</total_item_occurrences>
        <item>
            <hlevel>2</hlevel>
            <item_name>Length of stay</item_name>
            <item_key>\\i2b2_VISIT\i2b2\Visit Details\Length of stay\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>Visit Details \ Length of stay</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
    </panel>
</ns4:query_definition>

```

I want to find the length of stay for any patient visit within the i2b2 database, using the "Visit Details" panel, with a specificity scale of 0 and a panel timing of "ANY", with a panel accuracy scale of 100 and no inversion applied, and only one item occurrence required, focusing on the "Length of Stay" item with the hierarchy level of 2, using the key "\\i2b2_VISIT\i2b2\Visit Details\Length of stay\" and a tooltip of "Visit Details \ Length of stay".