You Out of pocket fee paying? Meaning you dont use a third party adminstrator like aviva, mhc or some benefit cards?

It is unlikely that a gp will be reluctant to give you mc

Coz you full fee paying and is their source of their revenue. So to make you as their loyal customer usually will accede to you. Then they will be extra polite and nice too

However if you on some insurance/tpa scheme, that they will be remunerated just $5 they will be unlikely to give. Coz if they acede to your mc seeking behaviour, this encourages repeat visit and they arent really that keen on seeing you for only $5. Every tpa visit patient they see is precious time and money lost

For polyclinics, saf nsf we dont give more than 1 days. Too many chao keng.
For working adults dont really give too coz we must not decrease the productivity of the nation

Now is easy though, just say i got fever , dry cough, i think got covid. U get a swab and automatic 5 days mc