Table:
text: 1970–71 Segunda División
League table
League table
Position_ Club Played Points Wins Draws Losses Goals_for Goals_against Goal_Difference
1 Real Betis 38 53 20 13 5 54 28 +26
2 Burgos CF 38 45 19 7 12 46 30 +16
3 Deportivo La Coruña 38 45 18 9 11 44 32 +12
4 Córdoba CF 38 45 17 11 10 50 30 +20
5 Rayo Vallecano 38 45 18 9 11 51 29 +21
6 CD Castellón 38 43 16 11 11 40 31 +9
7 CD San Andrés 38 40 14 12 12 34 36 -2
8 Club Ferrol 38 40 16 8 14 39 43 -4

text: 1970–71 Segunda División
League table
League table
Position_ Club Played Points Wins Draws Losses Goals_for Goals_against Goal_Difference
19 CF Calvo Sotelo 38 29 11 7 20 38 48 -10
20 Colonia Moscardó 38 23 6 11 21 22 51 -29

Question: What is the average playing time for the Segunda División 1970–71 when the club is "Burgos CF" and the draws are less than 7?