multiply results by praying or chanting at different places at different times

10 times more at each place...

house - 1 time = 1 time benefit

cow shed - 1time = 10 times benefit

Bank of river -  1 time = 100 times benefit

temple or under the basil plant - 1000 times

Sapt Ganga - 10000 times

seashore - 1 lakh times

peak of a mountain or hill - 10 lakh - 

chanting pranava OM namashivaya 9 crore time one will get pure

1 crore = 100 lakh = 10 of 10 lakh = 10 times on hill

9 crore times is 90 times on hill..

I am not sure if this is correct. 

Surya-Sankranti', Tula Sankranti and Mesh-Sankranti, Lunar eclipse and

Solar eclipse respectively