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That is certainly not my experience. The only time it takes a bit longer to get to Strava is on Sundays. I figure this is either because of all the weekend warriors putting load on Strava/Suunto's servers, or my runs tend to be longer on a Sunday meaning there is more data to transfer (though the file sizes aren't exactly huge and it's just text) or a combination of both. Never taken 48 hours!
Doesn't sound right tbh. I'll be the first to moan about the Suunto app but uploading activities and syncing across to Strava is one thing it does fast and reliably. There are a load of articles online, and you could try customer support before returning it.
FWIW I uploaded a run from lunch time earlier and it went straight over to Strava so seems unlikely to be a service outage or something like that.