Not to difficult there is a lot of leeway especially if you play on casual with upgrades.
These are my times on survival with no upgrades so you should have no trouble as long as you keep a similar pace to mine.
Chapter 1 - 11:54
Chapter 2 - 21:21
Chapter 3 - 33:50
Chapter 4 - 43:46
Chapter 5 - 1:05:57
Chapter 6 - 1:37:50
Chapter 7 - 1:56:24
Chapter 8 - 2:03:17
Chapter 9 - 2:22:11
Chapter 10 - 2:52:39
Chapter 11- 3:20:18
Chapter 12 - 3:32:30
Chapter 13 - 3:49:18
Chapter 14 - 4:11:07
Chapter 15 - 4:46:45