Try handjob once the condom is on.

Make more of a fuss of them in case there is nerves or there are medical issues or stress going on in their life.

Not sure why you are referring to clients as friends though as professional boundaries need to be maintained.

I mean "a friend" just to soften up the dictionary but I am talking about dick obviously. Thought it is pretty obvious.

This can be frequent, there are pros and cons. I would find out what the punter would like you to do, until then carry on just no need to be frantic. I find combination of hand and mouth usually successful. After you've tried for a reasonable length of time I find many punters are happy to just cuddle. I have repeat long-term regulars who do this, they just like the contact, the sexual closeness, being naked with a woman!

This can be frequent, there are pros and cons. I would find out what the punter would like you to do, until then carry on just no need to be frantic. I find combination of hand and mouth usually successful. After you've tried for a reasonable length of time I find many punters are happy to just cuddle. I have repeat long-term regulars who do this, they just like the contact, the sexual closeness, being naked with a woman!

Cons? Not frantic at all, but when things were going smoothly and nothing were showing he will be down in the middle, it kinda disturb the meeting structure.
also from my experience when it happens it is game over. At least I have no solution for it. But obviously they dont like that, so keep on trying to put him up, then give up for a bit and ready again when time is up soon.
And when he is up again it is kinda forced( not proper erection or weak) coz he didnt get enough time to regenerate.
Sometimes they mange to cum sometimes not, and if not there is this awkward atmosphere, even if they dont blame me.

I get this with older guys and at first I used to feel terrible and also kinda of rejected/unattractive until I realised that it's kind of their body their problem and there's a limit to what I can do to change the situation.
The more they feel anxious and stressed about it, the less likely they are to recover. So I try not to show I'm stressed about it!

I also wonder if I should keep things calmer early on. If they get to the point where they're about to cum and then back off, sometimes it can give them difficulty getting started again. Still experimenting with that one.

Yes with some with their agreement we get on with it, 'strike when the iron is hot' then spend remainder of the time either on me, or chatting, relaxing, cuddling.

Maybe try more lube on them, sometimes it can’t be helped though because of some health problems they might be having but it is hard work (no pun intended lol)

Never tried that. Lube when? What is suppose to change?