Patience Is Overrated
Patience is noble, but it's most useful for those who have time, specifically time to suffer.
More important than patience - in my opinion - is the ability to allow and accept. In many cases a feeling of impatience is not actually a sign of entitlement or arrogance, but a sign that the thing you are waiting for isn't worth the wait (to you). An unusual wait time may also be a sign that something is wrong, specifically, what you thought you were about to experience is not what you are about to experience.
A great example of this would be waiting for your food at a restaurant. More often than not, if your food is taking an unusually long time to come out, the server forgot to put your order in or, the kitchen is in a frenzy and it's not going to be amazing when it finally stumbles out. Again, the key word is "unusually". It's important that you have an idea of how long the thing you are waiting for generally takes to occur. If you're at an intersection waiting for the light to change and it's been over 5 minutes....that light is broken.
Consider medical symptoms. Being patient with certain aches and ailments can in time put you at greater medical risk. Or, better yet, consider the times you were patient with people that you eventually had to bitterly accept weren't ever going to change - and never did.
My point is, you should never intentionally allow yourself to suffer. Uncomfortability can lead to growth, but suffering does not lead to growth, and they are two very different things.
When you are working towards something that you value, it will never feel like suffering; no matter how demanding the task is. Psychologically, the notion of working towards something energizes the mind and equips the body to endure a certain level of pressure in order to achieve something valued. If the mind is not energized and the body is not equipped, there is a great chance the level of value does not match or exeed the level of pressure.
This is important to know. We regrettably
spend much of our lives suffering needlessly, putting up with the pressures of pursuing things that we don't value, (or things that turn out not to be the valuable thing we thought it was). We're not here forever. We don't know how long we're here, and one thing I am certain of is the fact that we were not designed to suffer for long periods of time. Know how long things generally take, consider the true value of the things you pursue - your spirit, mind, and body has an interesting way of directing us towards what we actually want and keeping us out of the things we don't want.
This interesting system is what we refer to as "pleasure" and "pain". Strangley, we were taught to minimize and manage the extent to which we indulge in pleasurable experiences, yet to endure pain as long as we can - and ironically for every suffering there is a Heaven that awaits. This kind of thinking is very sadistic (much like the people who introduce as well as spread these notions). It's also a lie.
Working hard as well as waiting can feel good, and they can also feel bad. Pay attention to how you feel when you do things. Not just how you feel in the moment but how you feel wholistically when you do things. If something doesn't feel right, pay attention to that feeling. If something feels good (wholistically), allow yourself more of that thing.