The expected value of the dice face will me 3.5= (1+2+3+4+5+6)/6 . So you should move up in multiples of 3.5 until you hit an even number:
1st roll expected value = 3.5
2nd roll expected value = 7(3.5+3.5)
3rd roll expeacted value = 10.5
4th roll = 14 = 3.5x4= An even number
So the expected amount of runs is 4.