Minecraft wiki entry for title, associated text: Specifies the time in game ticks (1/20ths of a second) for the screen title to fade in, stay, and fade out. In Bedrock Edition, values below 0 are treated as 0. If not specified, defaults to 10 (0.5 seconds), 70 (3.5 seconds), and 20 (1 second).
Must be a 32-bit integer number. In Java Edition, it must be between 0 and 2147483647 (inclusive). And in Bedrock Edition it must be between -2147483648 and 2147483647 (inclusive).