Only 3! Present, Future and Past. Oh, and imperative.
But there are 7 different verb "constructures", each of them with a different conjugation. Vowels are changing happily all the time, consonants appear and dissappear... Without a deep understanding of the structure, you won't know how to conjugate a verb. Infinitiv is rarely given, only the root. But it serves you more. But when you need an infinitive (modal tense), you are lost. :)
Oh, and there are soft and hard and whatever consonants which like to change into something else. There are all rules for it and it is regular. But many rules, many... :) But I love that language!