Will I have enough time to catch a flight from Bangkok to Kuala Lumpur?

Last year I travelled via bangkok with a 1-hour transit time, and it was comfortably managed. But as a transit penger in a connecting flight, I just walked into the departure through the transit, and it took about about 20-30 minutes to walk to the departure from the arrival. In your case, if you're booking the second flight separately, and you'll have to complete all customs before checking in again, it might take pretty longer, though I really don't have any experience of doing that. In that case a little longer transit time would be preferable. (BTW, does arrival time mean the time your plane touches the ground??)