All of a sudden recovery time is very long

At the begin of this week, my recovery has gone up. Normally it would be 18-48 hours.
Now I can hardly do a hard session, without the recovery going crazy. What normally would give me 24-36 additional hours (max) has given me 51.

Even a slow run (2.5 km at 7:10 min/km) gave be 24 hours Stuck out tongue That would normally not give me more than 1 hour or 2.