Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 4°C. We apply continuously 74°C heat to the field 2x5
What is the temperature (rounded to whole numbers) in the field 6x8 after 54 iterations according to the Gauss-Seidel iteration

Field in the beginning

4444444444
4444444444
4444444444
4444444444
4444444444
4444444444
4444444444
4444444444
4444444444
4444444444

Field after 4 iterations (rounded after 4th iteration)

1111111110
1223332221
1356543321
391614975431
824452917106431
14441195024138532
1128493320127532
71523191396431
481110864321
2345432211

Temperature in field 6x8 after 54 iterations: