Currently it is not possible to change the epoch duration after the chain has started.

These time units are defined in number of blocks.

Currently it is not possible to change the slot duration after the chain has started.

We assume that ~10% of the block weight is consumed by `on_initialize` handlers.

Time to execute an empty block.

ExtrinsicBaseWeight is the time to execute a NO-OP extrinsic, for example `System::remark`.

MaximumBlockWeight is the maximum weight 2 seconds of compute with a 6-second average block time, with maximum proof size.

We allow `Normal` extrinsics to fill up the block up to 75%, the rest can be used by Operational extrinsics.

1 in 4 blocks (on average, not counting collisions) will be primary BABE blocks.

RocksDbWeight for RocksDB, used throughout the runtime.