This statement beautifully conveys the idea that the joy and fulfillment of being with someone special far outweighs the time spent apart.
The phrase "A decade without is nothing compared to a day with you" emphasizes the profound impact and happiness that the person brings to the speaker's life. It suggests that even a brief moment together is more precious and significant than an extended period of separation.
Overall, this statement highlights the immense value and importance of the person in the speaker's life. It underscores the idea that their presence and the moments shared with them are irreplaceable and infinitely more meaningful than any length of time spent apart.