1 hour at marathon pace every week

Unless you're doing a marathon, you're better off doing mile reps at threshold.

5k. Yeah that's what I was thinking.

Ive put your details into a vdot calculator

Indicates that 6:21/km would be marathon pace. Easy pace would be 6:47/km to 7:26/km

But as above, what are you hoping to achieve here? AS there may be more efficient ways

EDIT
Are you trying to lower your 5k time?

in which case, an hour at that pace is fine, but realistically it might be worth looking at adding more speed work as well as a longer run on the weekends

Why did you default into /km for pace?

Depends. There are a lot of moving pieces.

-What events are you preparing?

-it wouldn't be detrimental

-60 min of running at a brisk pace feels good

-60 min PROGRESSION run. Increase pace every 15 min(or 5-20 min). Start with jog and increase every so often. Last 15 min is tempo "effort"

Effort "FEELS" like specific pace... Instead of locking yourself in a fixed pace, your training at an effort level.(Feels like this today, next week feels different, etc)

I would break it up if going an hour.

Cause anyone running 5m40/Mile wouldn't need advice on how to run faster. As they are already pretty fast.

But you're right. The vague OP didnt specify