Gas powers the transaction. The transaction consumes a certain amount of gas. Any remaining supplied (sent) gas is returned to the sender so there is no risk in sending extra gas. The transaction fails if the work cannot be completed before all the gas is gone.
GasPrice is Ether to spend per unit of gas burned. Think of it like paying $4.50/gal for gas and needed 1.6 gal for the trip. A car doesn't burn dollars directly. It burns gas and the engine is indifferent to the price paid for that gas. Consumption depends on work. The cost depends on what you paid for the gas and how much gas was burned. The amount burned depends on work which, in the case of an Ethereum transaction, is the nature of the transaction signed and the code that will run on the shared distributed computer.
transaction fee (trip cost) = gas (work done) * gasPrice (bid).
gasPrice is an offer to the miners. Miners generally prioritize transactions that pay the highest gasPrice - effectively skimming the most lucrative transactions available in the pending transaction pool, to make a block filled with gas consumption at the highest rates offered. As such, a low-priced transaction will generally not make it into a full block and may take quite a while to confirm.
In summary, gasPrice is a bid for priority and by lowering the gasPrice you have lowered the priority. There is no theoretical limit on how long it could potentially take but based on your description of what you did (yellow), it will probably confirm eventually.
Hope it helps.
