The number of “likes” given is based on Trust Levels.
Default likes per a 24 hour period: 30
Those that have reached Trust Level 2 (TL2) will get 1.5x more per day for a total of 45 likes per day. Those that are at Trust Level 3 (TL3) will get 2x more; so 60 likes per day.
A 24 hour period starts from your first “like”.