You can check the number of unconfirmed transactions here:

https://blockchain.info/unconfirmed-transactions

If the number is rising, it will take longer to get your transactions included, even if you use sufficient fees.

Also check here to see when the last blocks were mined:

https://blockchain.info/

If the last blocks were long ago, this means blocks are not being found at normal expected speed and it will take longer to get your transactions included.