A thousand.. each doing a separate task.

وَيَطُوفُ عَلَيْهِمْ وِلْدَانٌ مُخَلَّدُونَ إِذَا رَأَيْتَهُمْ حَسِبْتَهُمْ لُؤْلُؤاً مَنْثُوراً

There will circulate among them young boys made eternal. When you see them, you would think them [as beautiful as] scattered pearls.

Surah al-Insan 19

قال عبد الله بن عمرو رضي الله عنه:

ما من أحد من أهل الجنة إلا يسعى عليه ألف غلام كل غلام على عمل ليس عليه صاحبه

تفسير الطبري

Abdullah bin Amr رضي الله عنه said:

There is no inhabitant of Jannah except that a thousand young servants are working for him. Everyone of them will be working on a separate task to the other.

Tafsir at-Tabri