He is better off doing monthly payments in my opinion. Not sure why everyone is so worried though as they always pay. If he needs someone to hold the BTC and fill the wallet I can do it for him.
I like weekly payments. I'm not worried I know he is limited internet.
Part of the reason of weekly is keep a hot wallet with less BTC. If once a month hot wallet would have more BTC. I think weekly works best for people and the hot wallet. Its the limited internet that is slowing it down, but Macro will come through.