It’s a personal decision but IMO needs to reflect your level of insulin resistance and where you are in your journey with keto.
I’m a fan of 20g total or less. Why? You don’t need them. It doesn’t matter the level of activity, they are unnecessary. So my theory is to go as low as possible to stabilise BS and help with fat adaptation.
0-20 grams carbs
.6-.8 x Lean muscle mass = protein grams
The rest of your calories are fat grams
Up to TDEE and beyond if needed
What kind of training ?
There is a fat adaption period with an expected decline in performance initially
If you are new to Keto
And have an upcoming marathon or event
Timing is definitely a consideration
It may be better to wait until after that event to transition to keto.