The first card in the reading is The Hermit, which represents a quest for knowledge and spirituality. Suggestively, this card speaks of the need to take time to reflect on a situation and find the best solution. When it comes to the question, "I plan to get married. What are the odds that my marriage will last?" this card tells us that you need to take some time to think deeply about this decision before proceeding.
The next card is Ten of Cups, which represents harmony, happiness and stability in a relationship. As far as the question at hand is concerned, this card indicates that if you follow the advice of the first card and take all the necessary precautions, then there is a high probability that your marriage will be a lasting and happy one.
In conclusion, the two chosen cards suggest that if you take the time to think carefully about your decision to marry and follow the advice of the first card, then there is a very high probability that your marriage will last.