Ok guys... I did step for step and now the query works for the stage 
(progress).
The second thing (stage is multiplicator for time) I have no glue how to 
move on.

cards2learn = db((db.groupCards.card_id == db.card.id) \
        & (db.groupCards.studyGroup_id == auth.user.studyGroup_id) \
        & (session.chosenSubject_id == db.card.subject_id) \
        & (db.userCard.card_id == db.card.id)
        & (db.userCard.stage <= 5) \
        & (db.userCard.lastTimeLearned < (date.today() - 
timedelta(days=(1))))
        ).select(db.userCard.ALL,db.card.ALL,db.groupCards.ALL, 
left=db.userCard.on((db.userCard.card_id == db.card.id)))

timedelta(days=(1)) should be timedelta(days=(db.userCard.stage)) but it 
says:
<type 'exceptions.TypeError'> unsupported type for timedelta days 
component: Field
How do I use the db.userCard.stage in timedelta (stage is an integer field 
in the table)?

Many thanks for the previous answers!

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