One card on waking, five minutes
beginner5 minutes

The shortest practice there is: a single card in the morning, how to use it during the day and how to check it at night.
You draw a card as soon as you get up, with no question, and look at it for a minute. The instruction is simple: this image is the lens for the day. It announces nothing, it proposes a filter.
The part that makes it useful is choosing a word. Just one, the one that sums up what you see in that card this particular morning. For the Seven of Wands it might be "defend", or "position", or "tiredness", depending on the day. That word gets written down and left there.
During the day, the word works as a discreet reminder. There's no need to force coincidences or go hunting for signs. What usually happens is that at some point something fits obviously and then you remember the card, and on other days nothing fits, which is an equally valid result.
At night, thirty seconds: go back to the word and write whether the day had anything to do with it or not. This check is what turns the exercise into real learning of the deck, because each card accumulates concrete, lived associations instead of definitions read on a page.
It's also the best practice for anyone with little time or no energy left for long spreads. Five minutes a day for three months builds a relationship with the deck that no occasional ten-card spread can give you.
A warning: avoid using this card to make decisions about your day. If the Tower comes up, you don't cancel the meeting. The card describes a register to look through, not an instruction about what to do.