Putting on tefillin late
Someone was unable to put on tefilin when he 'davened' (prayed) shacharis.
When should he put on tefilin — immediately when he has the opportunity or when he davens mincha?
"When does the time to put them [Tephilin] on begin? When one can see a colleague standing four cubits away and recognize him, until sunset." M"T Hilkhoth Tephilin u'Mezuzah w'Seipher Torah 4:10
"The holiness associated with tefillin is very great. As long as a person is wearing tefillin on his head and arm, he will be humble and God-fearing and will not be drawn to frivolous behavior or empty speech. He will not turn his thoughts to evil matters, but rather will direct his heart to words of truth and justice. Accordingly, a person should try to wear [tefillin] throughout the entire day, for this is the mitzvah associated with them. Among the praises conveyed upon Rav, the student of Rabbenu Hakadosh, was that he was never seen walking four cubits without [reciting words of] Torah, without tzitzit, and without tefillin." M"T Hilkhoth Tephilin u'Mezuzah w'Seipher Torah 4:25