The positive progression steps for single column and/or dozen are the following:

1) first bet 1 unit, if lost remain, if won double the next -1/+2

2) second bet 2 units, if lost revert to 1 unit, if won double the next 0/+6

3) third bet 4 units, if lost revert to 1 unit, if won double the next +2/+14

4) fourth bet 8 units, if lost revert to 1 unit, if won double the next +6/+30

5) fifth bet 16 units, if lost revert to 1 unit, if won double the next +14/+62

6) sixth bet 32 units, if lost revert to 1 unit, if won double the next +30/+126

Personally I wouldn't dare beyond the 6th step, thus 126 units is the max win and the loss limit should be the same.