There is not a number that can easily be assigned to this. Things to considered. How many light bulbs are being powered? Are the accessories all going to powered at once? How much current does each accessory draw. Are you also running your train from this transformer? The 1033 is rather small. Rated 90 watts but this is input power. Output probably closer to 60 watts. If the transformer runs hot it is at its limit. If it trips its breaker it is past it.
Forest.