Welcome to Hubpages, Arthur.
There can be many combinations to answers your question:
2 Hubs x average 15 views each= 30 views total
5 Hubs x average 6 views each= 30 views total
10 Hubs x average 3 views each= 30 views total
15 Hubs x average 2 views each= 30 views total
In other words, there are no hard and fast rules. It depends on factors such as:
2. Engaging quotient
4. Uniqueness of content
4. Passage of time
of each hub to drive traffic.
Hence keep writing with patience till you reach your target.
All the best!