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.