Currently, there are 50+ quests that can be seen inside brave frontier so far where each of them is unique in its own way including the map that you need to travel between them in order to beat certain battles or simply put finding items. Therefore, you will surely spend lot of time playing this game especially when you progress through its campaign story line further. Furthermore, completing quest gives you rewards which can be used to summon new units for your squad or buying it with gems (which again might be nothing for brave frontier cheats users).