You are Indian by the looks of it, so you are getting a visa on arrival (VOA) you are not getting a Single Entry Tourist (SETV) So get a VOA, and then If you will come back to Bangkok on the 7th, and leave before the 15th, then get a re-entry permit. Arrival 2 to 3 hours before all international flights is recommended. If you want to stay past the 15th, then skip the Re-entry, go to Cambodia and then get another VOA when you come back.
Nobody knows, and one persons experience has no bearing on what yours will be. Might get 2, might get 3....You won't know until you are denied the next one.