In 1970 a guy named Thor had a reed raft built matching stuff found in an Egyptian tomb. He then rode it with friends from Morocco (Africa) to Barbados (Caribbean). The book is great if you can find it.
Travel time 59 days, but the rowers covered a longer distance - mainland Europe to mainland Americas.
The Algarve is close to Morocco, even if they left from Agadir, so not much difference in distance. The total drifting distance Agadir-Barbados is about 5500km, compared to nearly 6000km for rowing Algarve-Guiana.
In 48 days they could have drifted up to 4500km (75%), leaving over 1500km (25%) due to rowing, which is an average rowing speed of at least 1.3kph.
Travel time 59 days, but the rowers covered a longer distance - mainland Europe to mainland Americas.