Tercüme - Türkçe-İngilizce - her gün bir saat belirlesek ve bu saate msnde...

Ho kfeto, I would say:
"If we agreed on one hour each day to speak on MSN, would that be OK with you?

Typical case of an "if" clause.

What do you think?

sloppy...

I feel like "an hour" sounds better instead of one hour.

one hour
two hours

but an hour it is to state any hour