Waits for around 200 seconds before beginning to sync from 2,300 blocks in the past, then periodically receives small bundles of 1 to 10 blocks. The initial sync takes very little time.
Begins syncing from a hardcoded value (block#6219777) almost immediately, at a rate of approximately 23,500 blocks per minute. With a height at 6,500,000, this takes 15 minutes. Once synced, the light node receives blocks as they get mined and validated by full nodes.