I advise you to divide up your Rosary into three parts and to say each group of mysteries (five decades) at a different time of day. This is much better than saying the whole fifteen decades all at once.
If you cannot find the time to say a third part of the Rosary all at one time, say it gradually, a decade here and there. I am sure you can manage this; so that, in spite of your work and all the calls upon your time, you will have said the whole Rosary before going to bed.
Saint Francis de Sales sets us a very good example of faithfulness in this respect: once when he was quite exhausted from the visits of the day and remembered, towards midnight, that he had left a few decades of his Rosary unsaid, he would not go to bed until he had finished them on his knees, notwithstanding all the efforts of his secretary who saw he was tired and begged him to let the rest of his prayers go until the next day.
And do let me remind you just once more to copy the faithfulness, reverence and devotion of the holy friar who is mentioned in the Chronicles of Saint Francis and who always said his Rosary very devoutly and reverently before dinner. [I have told this story earlier in this book, THE SEVENTH ROSE - Crown of Roses.]
From page 95 and 96
Nihil Obstat, Gulielmus F. Hughes, S.T.L., Censor Librorium
Imprimatur, Thomas Edmundus Molloy, S.T.D., Archiepiscopus-Episcopus Brooklyniensis, 1954 For more, see The Holy Rosary
St. Louis-Marie Grignon de Montfort's The Secret of the Rosary