A conventional present (ḥāl ʿurfī) differs from a strictly philosophical instant. In ordinary usage, “now” may embrace an appreciable duration rather than a dimensionless moment.
“The student is praying” remains meaningful during the performance of different parts of prayer, even though those actions do not occur in one instant. Likewise, “I am giving a lesson” is a normal present-tense description during the lesson's duration.
Rhetorical analysis must respect established linguistic convention. Importing an extremely narrow philosophical definition into everyday temporal expressions can distort perfectly intelligible Arabic usage.