How long should you have to wait for landlord to fix stuff?

I have put in a few maintance requests that have never been answered. We had mould growing in our bathroom and ended up having to fix it ourself cause we couldnt wait and just leave it. The caulking around our tub is stripping and mildew is growing in there and it smells do they need to fix that? And now the power is out in our basement and no one has come after 4 days. Is that too long? We cant really move right now cause though because the rental market has gone crazy and there is no place at a decent price.