Farei modelos 3D para jogos

I model just about anything for roblox games, it could be low poly or it could be hyper realistic, model length depends roughly on how many models and what type. For example, lowpoly would take less time due to less detail whereas realistic ones would take more time. I export fbx and glb. When I export my models I merge all meshes into one model so when importing and you see it all together without its separated parts thats because I merge it.