When I timed it it averaged 7 seconds cool down and 3.25 seconds cast time for 10.25 seconds from heal to heal and 3.25 seconds from press to heal.Currently. It takes around 7 seconds to cast Touch. From press to heal. In that time a boss can cast buffs, AOEs, a succession of high dealing skills, or anything else that may suddenly kill the tank faster than expected.
I understand and appreciate the want for skill and timing in the support role, however with such a long casting time (dial + delay) and the randomizations of boss AI, timing heals has become a practice based on chance, not skill.
The beta has 8 seconds cool down and 2.25 seconds from press to heal (same 10.25s) which is about 2/3 the current lag (cast time). With cd reduce gear your total cast to cast time can be nearly 1/3 second faster or around a 3% buff to cd reduce gear boosts.