Heal while the shards show
Time crystals do two jobs. Picking one up extends the loop. Breaking one, and healing while the fragments are still visible, is how players describe the Amplification charge. The press kit calls time a currency you spend on heals, trades, and unlocks. Amplification is the lesson that ties the heal verb to the crystal’s break, not a second item in a menu.
I am not publishing a frame count. No developer post gives one. If the charge fails, the usual causes in the first-week threads are: you healed after the shards vanished, or you were on the full-health bug and the teaching crystal never entered your inventory.
The full-health bug
A Steam bug report said the teaching crystal would not unlock at full health. The developer replied that they had fixed it and expected the patch on Monday. That lines up with the 1.0.0.62 / 1.0.0.63 window. On the current build, stand in the lesson, break the crystal, and heal while you can still see the pieces. If nothing happens, file it at bugs.akuparagames.com rather than hunting a hidden crystal type.
Show the sourced solution
Break a time crystal and use Heal while the fragments are still visible. That is the player-tested Amplification window. The full-health pickup bug was fixed in the first week of patches.
Questions this page answers
How do you heal when the time crystal is healing amplification?
Use the heal action while the crystal’s fragments are still visible. Waiting until they fade misses the window. A full-health bug that blocked the lesson was patched in the first week.