Because of some technical compatibility issues, you can use almost all Quickbase field types in Form Engine forms, but not all. Here are the supported field types:
checkbox
currency
formula_checkbox
formula_currency
dblink
formula_email
file
float
formula_float
multitext
percent
formula_percent
phone
formula_phone
rating
formula_rating
recordid
text
richtext
formula_text
date
formula_date
timeofday
formula_timeofday
timestamp
formula_timestamp
url
formula_url
Here are the unsupported field types:
ICalendarButton
address
duration
formula_duration
predecessor
userid
formula_userid
multiuserid
formula_multiuserid
vCardButton
The way to handle some of these unsupported field types, like Duration and Duration formula fields, is to create a Rich Text Formula field and render the Duration field value in that field. Then you can use that field in your forms for output. If you need something like a Duration input field, use a Numeric field, and convert it to Duration in Quickbase.