Arif-billah Dr Abdul Hayy Arifi (Allah have mercy on him) said,

‘Time management is part of the Shariah.

The manner in which Prophet (Allah bless him and grant him peace) used to divide his time is explicitly reported in a tradition quoted in (the book) Shamail e Tirmizi.

That is, when at home Prophet (Allah bless him and grant him peace) used to divide his time into three parts. The first one was for worship of Allah. The second for his wives (and other household members). The third for his special Companions.’

Shu’b al Eman via Isha al Muslimeen, page 411