Actually, we can have a lot of option for time related spell such as:

1. Quickening regen = heal based on regen total potency on target (potecy x duration). Its kinda similar to sch ET, but the target/party should have the regen status first. Remove target regen status upon use. Only work for Asp. Bemefic and Asp. Helios regen

2. Enhance shield = reduce shield duration while increasing shield potancy on target. The target should have a shield first before we can enhance it. Only work for Asp. Bemefic and Asp. Helios shield

3. Extending buff = extend card buff/divination duration. Not applicable for extending regen/shield/other buff duration