Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
It takes Emmalyn and her research team, the Polar Bears, 30 minutes to fully navigate around a volcanic island. On Saturday, they decided to start off by rounding the island once. They then re-grouped and planned out the rest of their weekend research schedule. They completed 10 more round that day and then went home. When they came on Sunday, they were able to complete 15 rounds. Calculate the total time, in minutes, the Polar Bears spent circling the island over that weekend.

### Response:
On the first day, they did 1+10 = <<1+10=11>>11 rounds
On the second day, they did 15 rounds to reach 11+15 = 26 rounds
If each round took 30 minutes, they took a total of 26*30 = <<26*30=780>>780 minutes
#### 780