Minecraft:Redstone circuits/Clock/hopper clock

Hopper-Latch Hopper Clock
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2×4×3 (24 block volume) silent clock period: 8 ticks to 256 seconds (4m16s) The top hopper in the bottom layer contains 1 item. The top hopper in the top layer contains multiple items.

2-Stage MHDC (without Sticky Pistons)
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8x4x2 (64 block volume) 2 high, no sticky piston, multiplicative clock period: up to 81.9 hours (3.4 real-life days)<ref group="note" name="multitimes"/> The right hopper and right dropper contain multiple items. (This is a combination of the 2-Stage MHDC and the Modified Ethonian Hopper Clock)