Some types of L2, like roll-ups, settle to L1 every block.
The "whole point" of L2 is to reduce the amount of resources used to settle its transactions on L1. Some L2s, like Lightning Network, achieve this by settling infrequently. But other L2s, like roll-ups, achieve it by batching transactions in clever ways so that less L1 resources are used on a per-transaction basis.
The "whole point" of L2 is to reduce the amount of resources used to settle its transactions on L1. Some L2s, like Lightning Network, achieve this by settling infrequently. But other L2s, like roll-ups, achieve it by batching transactions in clever ways so that less L1 resources are used on a per-transaction basis.