It depends on what you mean by “30000 items,” but if you mean 30,000 item entities or stacks in a Minecraft world , loading can range from a few seconds to several minutes depending on whether the game is just reading them from disk or also simulating them in view. Reports from players show Minecraft startup or world loading can be around 30 seconds on a fast setup, but heavily modded or stressed worlds can take 5 to 20 minutes or more.

Practical estimate

For 30,000 items :

  • Barely noticeable hardware, unloaded area: often 5–30 seconds if the world is already generated and the game only has to load data.
  • Average PC with many entities nearby: about 30 seconds to 3 minutes.
  • Modded world, lots of entities, or chunk generation: 3–20+ minutes is possible, especially if the game is also generating new terrain or processing lots of item physics.

What changes the time

  • Item entities vs. inventory items: 30,000 loose item entities are far heavier than 30,000 items sitting in chests.
  • Chunk generation: if Minecraft must generate new chunks, load time jumps a lot.
  • Mods and render distance: bigger modpacks and high render distance can make loading much slower.
  • Storage speed and RAM: SSDs and enough memory help a lot; low RAM can make loading painfully slow.

Simple rule of thumb

If you’re asking about a normal world with 30,000 items stored in containers, it should usually load in seconds to under a minute. If those are active item entities in loaded chunks , expect noticeable lag or multi-minute loads , and in extreme modded cases it can be much worse.

Example

A world with 30,000 items spread across a few chests may open quickly, but a mob farm dumping thousands of dropped items on the ground can make the world feel like it “hangs” while loading or when you enter that area.

TL;DR: for 30,000 items, think seconds if stored normally , minutes if they’re active entities or the world is heavily modded.