How to approach a Large 3D model with UV and Materials?

So, shortly, i have a big 3d model and i’m thinking, should i split it into pieces/Materials, should i overlap texture, should i do something different? My game will have an artistic level of texture, i’m panting on Krita those textures, i want it to run even with intel based GPUs and less than 4GB ram, so i want 1k texture, max 2k texture. With this model, if i don’t overlap and use a single texture, i can’t achieve sharpness. Is secure to think that AAA games uses more than one material per BIG 3D model? My problem is only with Large 3D Models with like 5 Meters or more, could you guys help me?

What is the best aproach, i don’t want 4k texture and 4k texture can’t fix my problem when using one material( Sorry my bad english)

Here, three images, my barn model, my uv without overlap, my uv with overlap.

I don’t like overlap because i have to do it manually and i have to make another UV to lightmap, if the model has a lot of nearly identical uvs it take too many time. Thanks!

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Bump ------ someone can clarify this for me?