These docs are for an old release.
Info on upgrading to v5
eventLongPressDelay
For touch devices, the amount of time the user must hold down before an event becomes draggable.
Integer, default: 1000 (1 second)
This value is specified in milliseconds. If not specified, it falls back to longPressDelay.
Only applicable when the calendar is being used on a touch device. Otherwise, there is no delay.