SIMD-0525-2
Slot Time → 300ms
Slot time step 2 of 4: blocks every 300ms.
Slot Time → 300ms is active on Solana mainnet since epoch 1023 — activated ≈ 7 weeks ago.
- mainnet
- active since epoch 1023 · ≈ 7 weeks ago
- testnet
- active since epoch 1002 · ≈ 2 months ago
- devnet
- active since epoch 1118 · ≈ 2 months ago
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The full guideWhat breaks, what to check, and how to prepare →How we know
Solana ships protocol changes behind on-chain switches called feature gates. This page reads the switch itself about every minute — once an activation is requested, it completes at the next epoch boundary, which is where the countdown comes from. No announcements, no invented dates.