How to say:I've been doing it during the last two days and today is the third one

[Tamara]

Hi

In Russian, when we need to say, for example, 'I’ve been doing it during the last two days/weeks/ (and today is the third day/week/ while I’m doing this.)
we just say 'I’ve been doing this the third day/week.'

But, I suppose, in English it should be said someway differently... to not be confusing…

How do/would you normally express that?
_________________
It’s impossible to learn swimming without entering the water…

[Conchita]

you could say either:

This is the third day/week I've been doing this.

or:

I've been doing this for three days/weeks (now).

[Tamara]

Aha...
Thanks, Conchita!

PS

[Conchita]

[Aydincelenk]

This - this...
You've replaced my today by the second this, does it actually sound better?
Not only replaced today by this but also changed the tense. You see.

For me, "I have been doing it for the last three days today." is the best solution.

[Tamara]

Thank you for the explanation.