Hey guys 
I‘m using MetaMask and sent a transaction with a low gas price. I’m fine with waiting a couple of days. It’s not urgent. My question: How long can I hope that the gas price drops to my level? I read that MetaMask (Infura) takes the transaction out of the mempool after a while. Is that true? If so, how long does a transaction stays in the mempool before it gets deleted?
Thanks!