I’ve had a few people ask me what “time slot” (TS) they should use when setting up a talkgroup on a particular repeater. For DMR Tip 02, I'll focus on answering this and give you links for more information on finding repeaters and configuring your radio correctly.
Here is a good description of what a time slot is by NEDECN:
With a TDMA (time division multiple access) system like DMR, the mobile or portable radios are synchronized typically by a repeater and assigned a time slot. In DMR Tier 2, there are two time slots, i.e. 2-slot TDMA. A mobile radio transmits for 30 milliseconds and then receives for 30 milliseconds. It listens for a permission to transmit and then begins a call to all other talk group members who will also receive on that same time slot, e.g., Time Slot 1. Meanwhile, a different group of users on another talk group could be using Time Slot 2 simultaneously. Well almost simultaneously, offset by 30 ms., but you would never know the difference, because two voices can come out of two radios simultaneously from the same repeater.