There are 3 periods where holders get its rewards.

Taken from their site:
During pre-sale you get Double HODLER reward stake (200% compared to normal sale). Eg. you buy 1000 HEAL tokens during pre-sale, you get 2000 HEAL token stake within HODLER reward.

HODLER lot 3 months: 1,000,000 HEAL
HODLER lot 6 months: 2,000,000 HEAL
HODLER lot 9 months: 7,000,000 HEAL

It's all well written on official page.